Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfe6582bd33255f…

MALICIOUS

PDF

92.2 KB Created: 2021-07-16 08:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 584012a0b70b4cc54961078816c2abe1 SHA-1: 59dd0b3c0e36fc6bfc3089c32d11def419630b0e SHA-256: 8dfe6582bd33255fcf3f217a62810d0c6233608d900958bb6e91e6027168b8d7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple link farm heuristics reinforces the conclusion that this document is part of a malicious redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://btsmstlucia.com/atomicsteps/upload/userfiles/file/89126055667.pdf In PDF document text
    • http://ellev.fr/upload/files/45742755302.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/89628473880.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/43441793025.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/1p4agkov0f9kqlh3tg1pg55ej1/pibun.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/70219494533.pdfIn PDF document text
    • https://norservis.com/files/files/velid.pdfIn PDF document text
    • http://cocoal.com/uploads/file/16658625313.pdfIn PDF document text
    • https://hirurgija.me//files/64438963631.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/62729304184.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/44402903515.pdfIn PDF document text
    • https://lesura.net/userfiles/file/22636097480.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/sutalonogizedebilafalalel.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/91588639868.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b11b65b87---jutanutubuvi.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/nuwufimimatazixozelomilor.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/37264872484.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/70949803009.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/fakeginovefozebusafemoje.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160acb8bbef354---65904928690.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/20a7b860166dca13f59966e24299a023/24299758642.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160872229a9423---senudekak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=navodaya+admission+for+class+6PDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7f8c052862a47906c7a27e287234402c/sumelubemuwetalatolewuf.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_off0001051b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 10732 bytes
SHA-256: c3f086daf6843c99c7dc8e30e8cd1959e47afec049070831db34f7f4d7a7c28e
font_01_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 17496 bytes
SHA-256: 652e1a6fb9635d31bf75efd0513a65938e43e766b0e2af6ae715c3869ab146b7
font_02_sfnt_off00014bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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