Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbe0e6149feddf7…

MALICIOUS

PDF

91.6 KB Created: 2021-06-26 01:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bcb4d69a1571165673ee011f775c000 SHA-1: 4c2b32a63353dab26aad54559d43a1aff4c5f441 SHA-256: 3cbe0e6149feddf7c87a85f8974f40ae57aa8f8f47f29e94d69435e7eeba2a55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's part of a link farm pointing to compromised websites. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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
  • 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://crysiq.ru/uplcv?utm_term=constipation+and+encephalopathy
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607250773f1bb---rulusenedixukifavog.pdf
    • http://timnhanhonline.com/upload/files/xisige.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/th81jd55fhra492tuqjh03nf0c/wedakaturevim.pdf
    • http://trendymamy.pl/userfiles/file/77817815827.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ca0e2d0c97fb25854eb4d7f2c75b8d46/xemiraw.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c2b785188---tawewawepasijerifini.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b92be527821---bepukewogenevep.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a8253c0fc0ea89059d1484f559a0fee1/98968127627.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/sgnu036kbftr0qc95njf2p8f05/resegejanefivegur.pdf
    • http://tznjl.com/userfiles/files/32872766840.pdf
    • http://guides2alpes.fr/uploads/file/sinufarobasojedenezawud.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16080747359fa7---jatilovutepaviviporaju.pdf
    • https://atamergranit.com/userfiles/file/merumoranusupom.pdf
    • http://bodegaadrover.com/userfiles//imagenes/11029786841.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/9dac33465fb15a9893d38b8940add9fd/wepinuvuw.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/nuleti.pdf
    • https://aradmissions.com/ci/userfiles/files/93514876412.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/359daac4f305c6ec0f6f1da2a9587b05/jexezajavijofepivofu.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/9aa30d22790f2798d9ab2a196eff981d/37978818214.pdf
    • https://goldenapp.net/file/vabovejoxepanusapobebu.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d376517793---deduruvejudasimopote.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609aba546beda---ronibipom.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d8e55602dfb4efe10b226706d433bee3/towopifugosig.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e9cbd9c78---44894084545.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://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_off00010526.bin
8ef0b2a46a2cae7eab111195ded419927bda4d1c0887f86f493801cb5cdb853b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 16736 bytes
font_01_sfnt_off000130bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130BF 16792 bytes
font_02_sfnt_off000148d6.bin
761358ee92bbb073bc775562127e592c00b0a8296cb94976b7f87ce164c02650
pdf-font-stream PDF embedded font (sfnt) at offset 0x148D6 10656 bytes