Malicious PDF — malware analysis report

Static analysis result for SHA-256 c793db7e1c5a94c9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 16:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c907057e7a952b531489e18c693c42af SHA-1: 2093937aaf95fc428fbcd279a99e6d02613c2343 SHA-256: c793db7e1c5a94c9017df036d6c6ca673a336e65ece1d9921a7b11b7ce4dcc0d
164 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, many of which point to websites hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160868ad3b2a6e---tanoborawulurisebu.pdf In PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/32514831914.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/biveraber.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/9867503758.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/dasomi.pdfIn PDF document text
    • http://nature-revive.org/files/file/rokejokegepurezobuwuvuxeb.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/50198192714.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210806004949_s8fbth.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/017fd6802db012c888afdd1f64047a03/2804491036.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/nibirevoginejokefaxobo.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/3b2662d7a03d59f8d04c90d149c36701/lifoler.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/60a6f69e40ec838c3031a896e66025e1/papidemogorabezusowekabin.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/17029220279.pdfIn PDF document text
    • http://manenshop.com/upload/files/jetonumudatudadizirigebo.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/putegariv.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/jopolomupomolozoweb.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bac9aad09cb---9592748887.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/tidetezorewotugatiwuke.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/81684969600.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/kabebulegudikojuwasezoduj.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6bc3a01cf13e96e9466f006376619a77/56288852953.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/solape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ap+grama+sachivalayam+panchayat+secretary+books+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_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 11460 bytes
SHA-256: 0987ed6562e781dd6460745d25376adb015c1ad68a791c1b2e73701e08cbfe5f
font_01_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 17328 bytes
SHA-256: 998bc2645492ace0fc34e7af90271b2b7356f4883ef8162eb5fdbafddab6ac20
font_02_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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