Malicious PDF — malware analysis report

Static analysis result for SHA-256 b928751d04f9ba78…

MALICIOUS

PDF

221.6 KB Created: 2021-08-02 21:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bbd9aa5dc90ada7178416b82e6755439 SHA-1: 29fbab8fd7e5a3e9f4a99fcccc1677f9c92b4198 SHA-256: b928751d04f9ba786037d94dec90f3742c1c523b590c3b7a240939202a2a1cb3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It leverages a link farm hosted on compromised WordPress sites, suggesting a phishing lure for job opportunities or invoices. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

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.
  • 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 https://cafesca.mx/ckfinder/userfiles/files/tidasewoduzoretov.pdf In PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085d728e235c---tavekeraj.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de6c1025735---pexazuwukaxatej.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/agtaa7q5k8kusia8ukui9ufouc/79104529064.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/wogewituwop.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb59412c05---30352094132.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/7282771907.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/58158546986.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/57453458511.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/58304211827.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/44168397130.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/furaxuzulurugatona.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/52c25ed1eb926c2fe77ff41c608c71d2/88858494923.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/c22e2154662ac477660895692da9e32e/rivuzoxojasusuvaw.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/13428732083.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/41492199968.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/342f30f91894904f93624238061fd8d3/dokilibatuvetopekatosef.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16105b7db2bd26---37762276105.pdfIn PDF document text
    • http://immopolignano.lu/images/batidemixewaj.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/xifusibilujafelewenumox.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/golonubu.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/5dea51e70d2459f97d94720f7f072f3b/kopabowifipatep.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/pekirumopu.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/41632292569.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/nikufakodegenefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=personal+assistant+jobs+atlanta+craigslistPDF 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_off00030336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30336 10676 bytes
SHA-256: 1b3b25cc4718cd4ad7786e252a831b3763bce33a533b3a4b4f24614a751a6465
font_01_sfnt_off00031bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31BD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000333e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x333E4 19240 bytes
SHA-256: 3f005a0d09ee415c38f38c9a1a684bbb924cfd00880e14fda96b4c8e8aacc9a9

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