Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffd4c151a626570…

MALICIOUS

PDF

91.0 KB Created: 2021-07-07 23:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95eecb999e0c9423ff264dfab44ddbd5 SHA-1: cddcfc5e855c575fc0cb20f3136c5644c5b5d48c SHA-256: 5ffd4c151a6265700602d5cc66ac54cf624a5d19d3b9f8df5a04b8cc86c285b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to malicious sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • 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.
  • 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://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/2c1e43068e06b7f412395a9ff59b8f0e/26706054089.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b8e53a47b---30112090529.pdf
    • http://vidol.nl/userfiles/file/4393270026.pdf
    • https://foreningenflex.se/anvandarbilder/173/files/82115025676.pdf
    • https://smilepaper.tw/archive/upload/files/824970625.pdf
    • https://aimhc.com/userfiles/file/71788434842.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/r551r25s597cfah1c85no6etqc/89279858227.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d364ba2c6---pifuvudamonetuseja.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/pu7lfsqgi6sm5111uv396t6md5/seguxil.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/bdcfc2cebb5f9d117140d9c0d313a3cd/wumezija.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/27f49204e8097a5d15ce7f8aca5eb857/lapisulazewetivovapofa.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/66501243175.pdf
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/97858653987.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/v1vdn6kg92ddanpm4a8oglue6p/79965761359.pdf
    • http://theheavent.com/userfiles/files/16186811987.pdf
    • https://alquimia.in/admin/fckeditor/editorfile/rijojaw.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca46f0576---nakuxo.pdf
    • http://arslanemlak.come/file/rirujetifen.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da9f8034d97---wurejilulopep.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b125e7800---66006804039.pdf
    • http://varanini.pl/userfiles/file/32466199383.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d6b09f8f---74710537789.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=family+life+cycle+approach
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000128d0.bin
d504eb36101f0002f4f1b4bbc6e7094ad6aa86ce285433013d51151022b29876
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x128D0 18452 bytes
font_00_sfnt_off0000e5a3.bin
ca30a676e89bfe693c541b05ce9ecbd85e54fdbfa0f880272f9a04c5fa36ad97
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 16576 bytes
font_01_sfnt_off000110bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 16792 bytes
font_03_sfnt_off00014679.bin
1cdc8f174238eee15322115b95c3574a45f85988a7be563c2718e9152fdad386
pdf-font-stream PDF embedded font (sfnt) at offset 0x14679 10464 bytes