Malicious PDF — malware analysis report

Static analysis result for SHA-256 df66a1a4f75d20c8…

MALICIOUS

PDF

101.1 KB Created: 2021-08-17 04:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fce0ed5f9a2b59a6c1c074bf7f52cf6 SHA-1: 08fdd7bbb57aaa8b211bb1f495d71f1e06097270 SHA-256: df66a1a4f75d20c8818574b49be788f6468d2a9bd0799cbd060bde3343a9f4da
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and link farm indicators supports this attack pattern.

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 http://strandedtattoo.net/file/80954530816.pdf
    • http://dahchen.tw/userfiles/file/vizoxeresuzubofojodijet.pdf
    • http://thaoduocvn.com/userfiles/image/file/pebelariru.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e31eef01a---2669926707.pdf
    • https://eitmedu.in/ckfinder/userfiles/files/46786367818.pdf
    • http://fluidearthconcrete.com/userfiles/file/25667010121.pdf
    • http://axwelindia.com/uploads/71240102618.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f7de33eb3d71e357d9e02015480acaec/85436461803.pdf
    • http://cableesmaltado.com/d/files/37390791237.pdf
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210617003658.pdf
    • http://weberstellen.ch/userfiles/file/91601276487.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/lfnuthr9sc9cudkk437jsiolou/nubosibejixesaweru.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c0696c1522d3b33503c757fe34d47ba6/kamuzoguzibewukefetowi.pdf
    • https://alamansyria.com/userfiles/file/74360180657.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/72f456b85292835ecf9eee982c2f1cd7/duruzifagasolakivumeletik.pdf
    • http://www.agenbenangbandung.net/file/nexadunavadorogiteg.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607effa45e65d---gikapuwogutebivinalenuwo.pdf
    • https://ratsimae.ee/media/contents/file/tefuvobonoziwuzos.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161149889c92ed---ravulujopazijenitizi.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/jarex.pdf
    • https://citronixdeflection.com/nbloom/fckuploads/file/xukem.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607760e58956e---22600071947.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=marcas+catalogo+tabla+de+calibracion+de+bujias+ngk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012395.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12395 16792 bytes
font_01_sfnt_off00013ba7.bin
a8eb25b55f21a6681f56b6bef73d88d241075d98fe40cc62a48f80a13478c67c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA7 18072 bytes
font_02_sfnt_off000169b3.bin
35296e9f2307308a9690a8066479612eb4ef7275c3d211641c17a00e24322e03
pdf-font-stream PDF embedded font (sfnt) at offset 0x169B3 11000 bytes