Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c29da940e9646ed…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 16:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38fa7434ad353e184e922393b6cb46bf SHA-1: 61a6367e7018ff1a2a73d46a1d2ca0e583ab5b02 SHA-256: 9c29da940e9646edda8f6da4b1388cf22b4bd130c5f434efaebc8eed017abe35
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the 'utm_term_redirector=True' flag further support the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdc687ccca---torazegazonalama.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf64d825a7---30064696334.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/tuvubabububimesawemagaw.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/domaga.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/tasidabikapoxanewuxi.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/xitudesaledok.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/diporapofuxorobegefe.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/nufazokulewoxobugapodi.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/32767313988.pdfIn PDF document text
    • https://qkon.ca/images/file/zarus.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/29015347896.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614071bb79c04---57880661171.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/lanujepufisosijepix.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/47876193640.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/mujolonafifegife.pdfIn PDF document text
    • http://didula.ru/img/file/23194901348.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433ec4259db---welunol.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161390b03ea967---22156803587.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/gugebaze.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/58342456842.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/22909769314.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/maxakalonon.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/58450245597.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/xirixevokurijepatopebikas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+install+beetv+on+android+phonePDF 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_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 17772 bytes
SHA-256: 4cf09e2256c2b947bcf6dee14475b80dfeb9864b5cc5d2feca26b68404b22479
font_01_sfnt_off000115c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C2 10772 bytes
SHA-256: b31e8eb46662188d47ed9db6c2400e501cc1dd5101a880e0ff0419235b6dc286
font_02_sfnt_off00012e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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