Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9422a16ac5b583b…

MALICIOUS

PDF

96.8 KB Created: 2021-08-29 09:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3cc1e2e97d2216660bb461296426e92a SHA-1: 993760d5bad371e4a4bac66e6f80fa9d1bb0ecd8 SHA-256: c9422a16ac5b583b738b76cd9af3c59c5b0d9ac9487aee5b6ac966421b91bcce
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://patp1ryb.ru/media/file/85575187974.pdf In PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/faf25174c9b840ff3966f325bbcb255d/51911408289.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/4hlsfbng13239e32mf4o52ink4/13813157313.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/nelidodumavemokuw.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/28313505683.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/95p5a68npjsb6t0cvkm1sb38gr/sobotetovux.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/sijepifamekarupoxamerikeb.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079772c318c2---38565192959.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ff1b1e80---gugomunenoke.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210701_143436.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/8f78eed46af61a99983cd2990b04fc8c/45491804155.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///47923572125.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/44170338799.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c757eb3ae43ccd8932710102a03cc5ae/6784246784.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/petiwanizikoxomewew.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/31916811088.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p4hmpaaqeuckqr3q9a9rrirdjm/44420505307.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/vfobk9h2l0lp3761s0169pnq6e/31337159443.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/gorarugalefakexej.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/qui8el0bl0ip08d6ten5tchmh0/10508524934.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080baac54c8f---63685476467.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e7d67198c6fa2b8c9caf795ad46db607/33301382583.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/90755580932.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac442040085---24884196769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=signals+and+systems+by+dr+sanjay+sharma+pdf+free+downloadPDF 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_off00010ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F2 20036 bytes
SHA-256: cb48e98fc6f242704694b825bcf86182a8806d7f882a0d7d005a5f8f9a1c54db
font_02_sfnt_off00015950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15950 11492 bytes
SHA-256: 7b9a4a998a8bbf039c2b101c846d2e829c289728491635f898e803ac19ebf20f

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