Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83ea7003ec56661…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 09:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ac1e2e1b1a34589541d5c3703bb2999 SHA-1: 53e2b154672fb3ef92ada24733c5d82d80b24282 SHA-256: f83ea7003ec5666170266274f03218f43a6a055fdb8edf5b82f16b71640fa201
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised websites, suggesting an attempt to deliver a malicious payload. The presence of a visual download button and link farm heuristics further support a phishing or malware distribution scheme. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://queure.ru/uplcv?utm_term=borderlands+2+gibbed PDF link annotation
    • http://thestarbusan.com/FileData/ckfinder/files/20210903_DF4BBF40DAE3E87F.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/tavanadiroza.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/wozufipozamisijodizaw.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/lobiz.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/93900351698.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/75849107484.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/begoradezafidumomep.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/96375654630.pdfIn PDF document text
    • http://santeh.md/img/files/fuxonif.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/lapuf.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/dilis.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/vumalogipijiviwajopoveteg.pdfIn PDF document text
    • https://mmtours.si/uploads/dorixizozodoveliliko.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/pukesolerad.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613930131c48a---87007144277.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/62194021589.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/batuvatosovetoxazenoden.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/dolorinotemuxotajili.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613192da0b319---boduwil.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613666d1130a8---vebokenegaj.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/gibolipumatesuwa.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/26686892904.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 17880 bytes
SHA-256: bf037f73ed4d2062dd477ab8c0701df76267590d57a9b6e2d093f5b5c3aa7d4d
font_02_sfnt_off00012ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBF 10636 bytes
SHA-256: f767416aa088f457caac0cac4da502abe1dbd2beb11aeb650305118121d08069

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