Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8ab58e5df16b88…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 05:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 608f12f90962715c363e2af9f1433d3c SHA-1: ad983cc6e615f57b508ee55d27deaf2841651a49 SHA-256: fb8ab58e5df16b88818413e1cebc26ded799c4d240f75412c07f504c4d969027
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external sites, many of which appear to be disposable hosting or compromised CMS uploads, suggesting a link farm or phishing lure. The critical heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a command-line context, a common technique to bypass initial security measures and execute further malicious code. The presence of multiple URLs and the nature of the heuristics strongly suggest this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • 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://coretry.ru/uplcv?utm_term=mac+set+android_home PDF link annotation
    • https://eghamatyab.com/basefile/bainbookcom/files/mivoxosafita.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210901170131.pdfIn PDF document text
    • http://hkacca.com/userfiles/lurerevuzusavipiripebebi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a899c3b2a6---tupitun.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/vogalulafus.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379d64c612b---lobakegisaxumitefulupomi.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/72549537611.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/86783720287.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/19951441902.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/giropubesutux.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161453a664a177---91701735320.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16139631f15c94---31760393326.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/gexodowodikefibiwiva.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/wudosirawogofo.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/741097307.pdfIn PDF document text
    • 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_off0000c8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 10616 bytes
SHA-256: af3f5d30a49aa90506c52fc2694396f345c06d0d9fdaeb3c609dd9d4bf6cf3a8
font_02_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 19432 bytes
SHA-256: 9ecdce2fb00a1c8139e3cf7c3289c083f3a67b118b5c329de0efb56b3fd4f790

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