Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f8795395b0115f…

MALICIOUS

PDF

84.1 KB Created: 2021-10-04 18:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c144c0874851d3c3907edf75728bc595 SHA-1: 4269e5dd283afa51f86283cc4ae35dd3d55e0e7a SHA-256: a9f8795395b0115f6add1ce46c8d1aba62814d8445062546c9c9407ab01308a8
164 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of a 'link farm' heuristic further supports the attack pattern of directing users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://irlanc.ru/uplcv?utm_term=sst+class+10+history+chapter+1+question+answer PDF link annotation
    • http://greenbrier101.com/userimages/35837445441.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/27000215278.pdfIn PDF document text
    • http://pronobile.com/catalog/file/voripivow.pdfIn PDF document text
    • https://sambelteri.com/contents/files/pewisalivefitafedibav.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/45652711629.pdfIn PDF document text
    • https://badrivishal.com/media/91336073113.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/53267481421.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/90134039175.pdfIn PDF document text
    • http://quinta.cl/upload/files/80629057947.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/34440884023.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/wirizolodedewo.pdfIn PDF document text
    • https://makenie.com/upload/files/22836545085.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/58363838586.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142db338749b---salazevilof.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/kepusigexuvarisofumezana.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/vumaraj.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/sopunozunimoxilo.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/65077766972.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/fepeg.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/793467c0149155618d79d5fa8a3e2986/noxuwi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26a68ac90---mipox.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/6585560724.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/78345220197.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_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 11164 bytes
SHA-256: bf159de7769d9752c7d98cde92c2a06840831be5c38e6e5bd16698c3848a4c39
font_01_sfnt_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 18152 bytes
SHA-256: 78d8e70c280db2414059c122d5bdb2ac19febe38e8045940ab7b21e0d793b296

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