Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c284428f972d09…

MALICIOUS

PDF

102.2 KB Created: 2021-08-01 04:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 630e97ec57e489c881306196df343218 SHA-1: ea98b6c65259f59568e7977461b8c97d50321999 SHA-256: a7c284428f972d09933de824dcb1774240319e17e518c692832c14d5eb52bd22
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and presents a deceptive interface with a download button and a lure to install a browser update, indicating an attempt to trick the user into executing a payload. The document also contains numerous links to compromised WordPress sites and disposable hosting, suggesting a distribution network for malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://aryajob.com/user_upload/file/lesizuwonitisagabodaw.pdf In PDF document text
    • http://farashimirooz.com/files/70387038649.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/tizebugizixuvixari.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/famumasumubepaligiboge.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/10770566566.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b000b12c97fdfef547c64e96c9ee63b2/37330645012.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa4521934---xogewomovukedapigus.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703a751cbc8---85476400203.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadc0f88111---30090977302.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68f35064f---4949805437.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/909cdd6688bc3c1bfb1a2f23810149fe/76258905872.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0669edf9fa---lamexepagir.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/81142191314.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/4ffae059134c788bdae90803514ef3de/96251661011.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/82797318981.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/18961787667.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/57159539374.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/kofipos.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/839ec10298cdf2b832d233725c9d0e22/6713225262.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160be970ea9dea---tagarezunuvisibufinijada.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/fd14b2f4ca0c98debb62d690f3b5098c/31512840482.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/vesid.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/87537h7n086b9mu82hp62mtdum/34911099919.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/98805524415.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333c5a7eff---92578768543.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/venuguvaxizupilize.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/909bfvcbhov2jep0vdomb4akp0/jagifenajop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=telkom+injector+files+2020+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012cf6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12CF6 23692 bytes
SHA-256: 7fe63f68107f6bfe978efd60e87c92e0e576360732ec9389a3109031d5e12654
font_00_sfnt_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 17972 bytes
SHA-256: 93011f36af17374b3b290219d47e3e2bfaaccc2011e64c4daf69c08bee679c87
font_02_sfnt_off000156d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EEF 11148 bytes
SHA-256: 2037326417ece63950c78b5d6697f1f970434e36300cc09e830b76622383e084