Malicious PDF — malware analysis report

Static analysis result for SHA-256 4beaec33904c6196…

MALICIOUS

PDF

83.7 KB Created: 2021-07-17 15:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f1334fecb7f333eaafaf4affeade5eb SHA-1: 72410fe846976c18830946fa8b4010865ead35c2 SHA-256: 4beaec33904c6196357ce61c3d9a7ea9d6a4eb8c23f82d230dca292885885975
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack designed to obscure the ultimate malicious destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/0c7432d02777461c681c10903844976a/89896159111.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ec8e886a4d26ae0e5382859dfd61264c/22190246579.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/8d8ffcbvr93lbe9heq46jl6jt8/sikukusoxifodid.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881c8ea1b05---bezalofapezavotisotibuj.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070364bd8eeb---nemiwomupogebutira.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/21ee6a8c617a6574e82cdd7c2b39c07a/dawamikituganidelokineka.pdf
    • http://urduhadith.org/survey/userfiles/files/64499887859.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ad49540d82b---93254665321.pdf
    • http://pension-erlkoenig.de/img/editor/file/gawizabu.pdf
    • http://ndt-tl.ru/upload/file/junititusulawokex.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6cfcaa0305037e2a8695bbf0b27dd955/15828699801.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beef66ac8bf---begobevidudu.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0050ef20b---pedeku.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0b6d608c8---vitavujomiverer.pdf
    • http://goodtraefarm.com/ckupload/files/fuginetafosojufiniguta.pdf
    • http://ukwoodrecycling.com/userfiles/files/74801717351.pdf
    • https://malabarmail.com/ckfinder/userfiles/files/47761101666.pdf
    • https://topplene.com/upload/ckfinder_temp/files/20210627005337.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/agfdfkpgd830e3sinvj17u944f/lenazovarozot.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920c70e1828---62907442524.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/68e0e6ddf220ede71d2ca6744407fd21/misaxeki.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=worksheet+for+english+class+1
    • 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_off0000e263.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 16792 bytes
font_01_sfnt_off0000fa7a.bin
1d6c664b3cd04e4b72aba4a93a00b2ba5fb11f0ff2330e52f77946b8ac1f321c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 10752 bytes
font_02_sfnt_off0001133f.bin
6b30492ac9a2d2ce0cc2c60c5890e932106ad256340b84c468c360d304467085
pdf-font-stream PDF embedded font (sfnt) at offset 0x1133F 18212 bytes