Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efb469350a3914d…

MALICIOUS

PDF

84.3 KB Created: 2021-07-26 16:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c139960cb5572399abaf906097d0436 SHA-1: f3b5bec753e844aa547f1027864d971831b0ac94 SHA-256: 9efb469350a3914d1996c5923a6f8f6bad6f5ccb22398a71b02dc93ec1bab548
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains multiple links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF link farm heuristics and the SE_INVOICE_LURE rule further support the phishing pretext, likely aiming to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://weingut-suppan.at/files/90580270654.pdf In PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/q6j7stslgc8krbci5djdmfqoqt/61706557209.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/35das67q42eeq6f4n0b2cis162/maneniv.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/52706672542.pdfIn PDF document text
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/jusozusowodonibevuwilumag.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/91648779395.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/joguba.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/77535204037.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609838607c5dd---46802138255.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c07ccb604e5---11860334532.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/bovenijegom.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077641e1c358---pogibepitimanumotemusulu.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/vojez.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092d7404a18d---lexapiferi.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/sopefetuv.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/114fa00996c4af99637b552d33101be5/95848517381.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/9524294089.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/b6f1c73a9a62b2c24d99a91332e3ee40/46519773973.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d49b84cd810b92d4cc3442038830dbd4/73229777504.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/gederix.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/mobusunefapomejelalas.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc3a7f277414d1a2fa1650577a6a06fd/losejas.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/bf29e253d6924da1ebc208cd272fd8d0/kiruvoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dhl+airbill+form+pdfPDF 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_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 10404 bytes
SHA-256: 3f720025e1801f392c07b73db82e53a96d990131214b0398d3f33b4ba23fe0ff
font_01_sfnt_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 17324 bytes
SHA-256: 0057377ebb773d5bcffe8efaf1cec7c1ab0bf382e29919a0e8e4892d7a9c24dd
font_02_sfnt_off00012b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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