Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c28915f3489b05…

MALICIOUS

PDF

84.1 KB Created: 2021-09-11 21:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 405489a45544082782fad0f3a1f4649d SHA-1: 6de21cce1bbc401511ef880e13bca01b6e32c7a6 SHA-256: f6c28915f3489b05f5353766ef29671e2e8a5f4fc9fa0a7f779b8d5364a2117d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, a common tactic for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://falconartistmanagement.com/ckfinder/userfiles/files/bowovaxasi.pdf In PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9b593fcac---41281273328.pdfIn PDF document text
    • http://rnralpha.cz/res/file/71769023565.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/zodimebubema.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/lilaxuvelazoluropobizafe.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/38953491150.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/fosuwegikufilajubiditine.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/sejef.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/80237816895.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/89310731130.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4aabd9394---48442757748.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/4846161688.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/gemepugaguwojanobukuweget.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f182bb4cf---56997295643.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/97368325712.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/godubenukukepubonot.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/zuxofewalobuba.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/97564635700.pdfIn PDF document text
    • http://talleresjpg.es/img/file/41539775709.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/luxibazipe.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109110450223425.pdfIn PDF document text
    • http://moretonassets.net/userfiles/rovukimizigidolanisevifa.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/wigerine.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/vaxudasudoxeter.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/xawijipaxiluvuvidejod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=telecharger+google+maps+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB61 16432 bytes
SHA-256: 73ced1e06b0f7973c1f931ba29b4d57b2a6e00dec4a266b2f27de0ca3be022a8
font_01_sfnt_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 10824 bytes
SHA-256: 36ac94b0516f91e5403718a75c9534af15e1a99faa89bc6cde2abd4615daedf2
font_02_sfnt_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 17928 bytes
SHA-256: 6597e9d66122b913b76172e42795883848900477879f15b7b93a892b7382b774
font_03_sfnt_off000129fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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