Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b771d71c18cab3…

MALICIOUS

PDF

117.1 KB Created: 2021-06-29 14:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 156950452c61ccab3e42188bd590e7b7 SHA-1: 9e92993475d311a3e359794db436fb10418a21c7 SHA-256: 67b771d71c18cab3372cde6a632cc6e7c202803de20b9b620728a03ebb6be555
154 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5991

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://drafthe.ru/uplcv?utm_term=10th+science+atoms+and+molecules+book+back+answers
    • https://vieclamkythuat123.com/upload/files/92259564563.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/78cf8a235e9207daf0d3822cf83dab9f/fowalorilapekoxor.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b045dbd4d421d942d45bb1844c139a28/87886920284.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/d257a849d8ffacfe55e1a2dfbb0b35c2/84795126158.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a174575770a---kuruwujumoju.pdf
    • http://aj-logistics.com/stock/userfiles/file/121534169.pdf
    • http://ithaca1962.com/clients/41687/File/32875466627.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2j6at09d1viil4g01thpdh83uv/fulewifarugovejusaj.pdf
    • http://propertiproperty.com/Uploads/userfiles/files/57312437033.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/8fef32a22482231af12a92a71bdd4f84/pijedufejejonabolaxapukuz.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/19c3421d7cf8852af6ac8b3d86d17fad/4600756705.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0844309146---fajegakudakokimezumi.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/j1at87q4ttf2ior8br5ik01pl9/84038985377.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i6t98t9r63j22nlq3s0pu7g1c3/siposuwanugudemuduf.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc452c262d---nedobexepit.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/dutepakogivexup.pdf
    • http://foto-klub.dk/userfiles/file/90754678664.pdf
    • https://preprodpcb.com/userfiles/files/24004649323.pdf
    • http://classicalgardenornaments.com/uplds/file/fabuwexiwajakuli.pdf
    • http://filtrydokoparek.pl/img/all/1509420015.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc87c1c78f0---xukatajemufoxalafex.pdf
    • http://loadcell.vn/Images_upload/files/gelesot.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c0b175b63a5dd2d29e9f7fb30e517609/levuwuvatukume.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4ab63fb8b---2589159891.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019e0b.bin
15444ed7d165c98ec12a316de6d917e579ec63c04d58f009a2c6e8087e11519c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19E0B 19192 bytes

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