Malicious PDF — malware analysis report

Static analysis result for SHA-256 831b8b91d4832ce9…

MALICIOUS

PDF

89.3 KB Created: 2021-08-03 04:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ab08cd27b0a700989847fb6719de94c SHA-1: bb8e7199b9811859e34c6bb0cc501c636d315586 SHA-256: 831b8b91d4832ce99aee09945f120dd27e178618b933d8c5904ed9aa3d7cd441
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS uploads and disposable hosting, indicating a malicious workflow. The presence of a visual download button further supports a lure-based attack pattern. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://icltindia.in/userfiles/file/gurasamisamoxajum.pdf In PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/20783abec37de1f10bc698bccace3c31/37217699333.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/29546062785.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/ghd6s97sukhugb3o0uamqpa9ki/64316045171.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609271494c44c---nokiwidovofadume.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/zevunalinuxikifunuxaxaxi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a881441133b---vujet.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/xikapej.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/64182544950.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a1df95e3ca06b9ae31be6b80bf9284c0/padomifirikejojawi.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0a0e8b234---zilon.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5893a3f6c3dc957c2d86d0ca9a2ccf6e/22525533714.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/nagebajimaremamena.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071c8ac70803---54721874039.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/wovas.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/173dc9c31da0d2dd5ba77018bf4e0e33/wewiziwofekagaguger.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/pogomupuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+pitch+perfect+moviePDF 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_off0000f955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 10868 bytes
SHA-256: 776760dd76d4b6690873dc67d5cbf12fa347f453697d7bde222caa213d0a1ea1
font_01_sfnt_off00011245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11245 17196 bytes
SHA-256: 70f0145e93571b87ccb2b130255efa1869207f1bf0040386a6e3534886ffe249
font_02_sfnt_off00013f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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