Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd2a6897516583c…

MALICIOUS

PDF

95.7 KB Created: 2021-07-29 22:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cfeda62e18f05156e7a5dec40d1f3af3 SHA-1: 7c25f8c84400ab785a7320d394c210801e51af1c SHA-256: 8bd2a6897516583c8a2f185df9cffc26eb6622b924ad9ff68c687c569aea2433
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting and a potential invoice lure. The embedded URLs point to various PDF files hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The document body is unreadable, but the heuristics strongly suggest a phishing campaign using malicious PDF attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://mfdesign.hu/files/file/19760591703.pdf In PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a832752161---51698450734.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/89627484121.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/5977654914.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/52514067765.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/19632128601.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/39300759442.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2040ef4b99e3ea3e0f64eda7faf49856/vofenitafidemugazofa.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/40282984472.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/idaft1dcl8obr0sv7s8017unh5/porazanetap.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/donumapepogopivulepigejo.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/07d28ac42b7f9f67c7e75e611df0cda1/88641742229.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/g7l5l1gv5ii1jqcrjtnl7njm0f/jakaxafobidikuforosag.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/8711e869f8122e10680d6d8aa55a186a/gigexiko.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/pogulejidiriripasinoniw.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/nidapavaxilumuberolisu.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/59ede81525a3b5540e9bc6c445308b66/vepiditufupo.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/9521391430.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2de895a4c1---podom.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/maguwegagezamonirevus.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/jetuwabukag.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/romuvukusalibiwizuseden.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cuanto+se+paga+de+tenencia+vehicular+2020+en+veracruzPDF 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_off00010d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9E 11292 bytes
SHA-256: 19205820047aff444106bc9fa04949eef26dc56a5ba63b4047a62ee3d045ce1a
font_01_sfnt_off00012801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12801 18232 bytes
SHA-256: ab4ea75dc249094bacfdf9555c019555bfedb15634674fcd6ffb606a8efeaac8
font_02_sfnt_off000156a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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