Malicious PDF — malware analysis report

Static analysis result for SHA-256 e30f5b964a14a48d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 22:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: badb8fc6aa84f07a153bd77bec15b252 SHA-1: ef45085de7721a4f2cb80a331d50a5bc40ec762c SHA-256: e30f5b964a14a48dbf50c9457b67ea095d8ff3f6c2d2df82baaf39963d1549bd
172 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also functions as a link farm, directing users to multiple domains, some of which appear to be compromised or disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate the download of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bocion.com/ckfinder/userfiles/files/33905471053.pdf In PDF document text
    • http://kxnjl.com/userfiles/files/kisabefujalajufivejot.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/2dc8435222843641e8d4ab7d93c2e935/kasedavazurimivigugar.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2255e9131a---68939574054.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/0kavsh9blhus41p4guhunflqpu/86302698830.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/8pl5hgroj2ahdv6hvt0pilglho/78134965627.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/88008943287.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/dofazimasosesixok.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/biralexijibarutok.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098445fa1f6b---bomisedinugapubexufupe.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/perivanevodazo.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/mulijo.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/48302491747.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/g1t466ajkhumv6i83enktbbp63/mitidawijobekuxifidu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb8043e01---tosora.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c65b3d80db2---pifefefizugema.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/40185395549.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/fukugegi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c6229f5b---sivefanixajoto.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/fibizeguzefulunarokevew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=microcontroller+lecture+notes+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 17060 bytes
SHA-256: 1c93bf2e8656b8deb6501b89b0b9140595d1f339647db33b1c6968e26196b58d
font_01_sfnt_off000105b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 10544 bytes
SHA-256: 0937a55b9d3d07b373a1fc2cefda6101fcefc4f9ec6faf95bb5627f08dd24074

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