Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcd2e5824b3bbc6…

MALICIOUS

PDF

65.8 KB Created: 2021-06-24 21:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: acc1632c0ef6588b0b0ebc949cb3eeb7 SHA-1: 0767578415aa9a99df082b18b773309c5492aca9 SHA-256: 0fcd2e5824b3bbc6a67b986c540a4e26d0f25e9c4d5b3de2bb63936a684ffe98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised WordPress sites hosting PDF files, likely as part of a phishing or malware distribution scheme. The presence of external URIs and link farms on potentially compromised CMS uploads suggests an attempt to obscure the true destination and leverage existing infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160889cda8a280---majadupudobunulovatoj.pdf In PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821429d110b---fujozelilowodexatuf.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160770b35da530---46324243194.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4dfead65e4af95dc0176b3b04093cd1f/sujesudepofazovubadevu.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160945cb0b5bb5---fagagireg.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/6229828208.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ibvklt5f84jcdf5bn5bdtt6gm7/nuvikaxobitorokub.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/67995185674.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7056750424.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/nibakejediza.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210531061555.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/85631552942.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/7294773443.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/vimuludepedored.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210514105339_1277770413.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02e16433b---86313087854.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+play+harmonica+pdfPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D3 5044 bytes
SHA-256: 4428495cac9600ec61f084ecdb6170367bad8d81d4da2f9f98b1ef019b7237cb
font_01_sfnt_off0000c9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D6 10252 bytes
SHA-256: 7f63cb6c40c965fc5fd3d3e5a127c598875c135c8820705ab0e1099413202024
font_02_sfnt_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f