Malicious PDF — malware analysis report

Static analysis result for SHA-256 572624637fcf6053…

MALICIOUS

PDF

93.3 KB Created: 2021-07-29 19:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4edafa9dd6c94518b01858a16651c745 SHA-1: 33ac3b1be3480ea9d4ec83161e4b57174ca57a7a SHA-256: 572624637fcf6053579487906d094ea61c6673180ecc68f21511da19d6ca4690
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farms pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple PDF-specific heuristics related to link farms and external URIs supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://crewmak.ru/uplcv?utm_term=que+es+obra+abierta+para+umberto+eco PDF link annotation
    • http://zge-led.com/luodan/images/userfiles/file/48439408409.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b9f1ba05c---motev.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/37023729179.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/41207248869.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f5288df6---dekovej.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071cdddec7b7---9830492691.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/mufifime.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/61b2ea1c11661b9e006c21f7f307f80b/dedulaxesisakizinakeraf.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/26347461305.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/94203353528.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/85064753712.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a15237c35c6f4b204c87ca1a0993d90b/31032658341.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a542731c6cb---xamizitusamed.pdfIn PDF document text
    • http://praguetransfer.com/files/file/nilazigig.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/namifovazugojinuki.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/lufo8g27e7ktb3051q9q8u5nt4/vekewazarajotixevu.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16076a473cd858---fogaparajagevixawut.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/wirisugajodetowam.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/29387113302.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/78198170956.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcba53aa053856333f0fe2f1d5a6165b/mowiriwijimidoronapajid.pdfIn PDF document text
    • http://rayer.cn/d/files/vududatewolamaden.pdfIn PDF document text
    • https://efnnma.org/files/file/biwuxo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607222f8e255b---7396637749.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10588 10684 bytes
SHA-256: bfd12892d252c7b082e2e25c2b6565e92acccac55733768252cd07b9ce7b7422
font_01_sfnt_off00011dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFD 18840 bytes
SHA-256: 493ff927e482f703a58ac5245a77f36908401bf1bc226c744d5fa2675f4d8399
font_02_sfnt_off00014cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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