Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36e496f7aef408c…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 14:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 05f58db3e0cd36f62188f537cbfa131f SHA-1: 2e57c9f98abd8c13cc981198aee26c05516f712f SHA-256: a36e496f7aef408ca58583ea987f882819cf9cf55356994f896e0fe2badfa20a
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. These links likely serve as a lure for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://apricomm.com/userData/board/file/69900395750.pdf In PDF document text
    • http://nusratali.com/userfiles/files/duvexe.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/32518886815.pdfIn PDF document text
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/letivomowiti.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/70878827854.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/l8modggq450hvcfkntc7tspf60/rirekugatorevepekakiraji.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9f22279c685f80a5c70c4904088e8ec1/70204548060.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebb3ddd906---21345079254.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/36507497607.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/dixedusadazusubi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd579969552---pivutolur.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/15674881224.pdfIn PDF document text
    • https://vayoto.vn/userfiles/file/1630668131.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/nesevitixusata.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/rilafivedosowo.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d1373d3b76195899e74414809c1a8435/borumok.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d507a5719d---82056138499.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/renakanaziregomisefef.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fd67151c18c---wiwuvizobibusatadel.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a11ae3ebcb02d326c6a07d94451cb8e3/gijedotelumimuripol.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/dipinaramevivutoxew.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/34098448404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=phrasal+verbs+worksheet+pre+intermediatePDF 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://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_off0000b9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A3 17444 bytes
SHA-256: 75b0d0f00bbcc922526333f746912d2eb7c5f4a304288b5731e72ce38e4f3508
font_01_sfnt_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE87 11044 bytes
SHA-256: 7e13b8cb2b71932e7b03cc611061f54fe9031118e153241d784a95f41fae0fa4

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