Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b98ea3f7993bcbb…

MALICIOUS

PDF

81.8 KB Created: 2021-06-21 03:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 809cf9257f30589ec680968e689882b5 SHA-1: 1e6dc5426bc6cf03abbbc5894e316b4841d8c824 SHA-256: 8b98ea3f7993bcbb88f849588a7b9d434d432bba1169d992e6e05243e59a4fb0
172 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to potentially compromised WordPress sites, and uses a lure related to "lords mobile hack unlimited gems" to entice users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing or trojan payload. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ruoumoc.com/upload/files/tifasopizo.pdf
    • https://bruceautoservice.com/files/file/42168484943.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/52053121434a206f3a2cc45e43782c5c/69870997155.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/fb5af7199cf21e624243d8e5e8cb0ea4/ruzawepex.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/c3a260d8484678626b1a8ccd9eab9499/71957247631.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/8ce00ffadbecf51f2da849fec5532903/tepil.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990f920c070---59739282788.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086962bc9d42---jikuwokakifinabo.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ea58401f3---94936008544.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/38147053109.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d8f4592b9---10901409979.pdf
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/mitutujo.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607693299ec94---soxoxekuvevukiwuvipikopud.pdf
    • http://yngc.ru/admin/ckfinder/userfiles/files/nasezolofajukegidiwakajod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=lords+mobile+hack+unlimited+gems
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082be144b84f---86371083034.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8dc.bin
4190382024856f787b2e498b4f99f9102aec435eb871618ca335bcfcec6dd733
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 5496 bytes
font_01_sfnt_off0000fb5b.bin
79902d68f2d852f69aade1f7ba1611726767235611645b34a61fc51995485658
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 11684 bytes
font_02_sfnt_off00012347.bin
1733294cd4efe6eb5a1c38b033a3da0bd69f43be3259469e0667c8323d1c848a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12347 16092 bytes