Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75139e0208dd065…

MALICIOUS

PDF

77.8 KB Created: 2021-09-04 14:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c054ab05eb650d99509d9b1cdcac5d2a SHA-1: c516d2f12b9624fac5406f6bcb4124f8e588f7ab SHA-256: c75139e0208dd065b806aac51e4a3548bb1b58b724e8882a0acda06d6e5ebd75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised WordPress installations and disposable hosting. The heuristic 'SE_INVOICE_LURE' suggests a phishing or payment scam pretext for the links. The primary attack pattern involves tricking users into visiting these links, which likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1560b4f74---kilavomizogetatabujin.pdf In PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/88e792ff9c3370f12e9b3470a6826bc2/jokejeluduzewokikesida.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/lexaweba.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/18147870641.pdfIn PDF document text
    • http://kodemari.info/data/files/46003130032.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/20667786512.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/90386542025.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825be51a1c7---91960443468.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/23563649081.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/56898573910.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/55690890605.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/64227006159.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b343dead6b6---bigax.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/s9lkf0qm43p7nik5lkkrr979f0/bupikevamamobe.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/kplmtjo0hj0tavnru5jvujq9s1/fonafarepuxi.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/60363446927.pdfIn PDF document text
    • http://imaginove.eu/data/Files/21793123839.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac5d7d165f---27738048608.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca302bbd86---67595666617.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ed0eab69d---davesaluriwusalerifekafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=list+of+collocation+words+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_off0000cd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 10524 bytes
SHA-256: baeb0b6d8881b36c9d78dfba2e53a06a61a53fb6b59dfced607f4327c8c0a36b
font_02_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 17512 bytes
SHA-256: 9da67c8055b227354058f9dad1095e5bf775bb73b066c1cdbb6f0c09435b7b27

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