Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed31c54238b47af…

MALICIOUS

PDF

84.6 KB Created: 2021-07-30 23:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9f4ed339a78d171d10776d70405f8de3 SHA-1: 1cbbca33cc9df262f0a127010572e888e92a3b7e SHA-256: 1ed31c54238b47af92275ffc7218524d76c06b1540cc44aafca3ba977a48d92f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious sites. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. No scripts were extracted from this sample, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://infrive.ru/uplcv?utm_term=how+to+identify+pigments+in+chromatography PDF link annotation
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fcd4547d1f8ef0c0159270841794dc99/jajopewotaxizovemi.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/25280923259.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de9b020c77b---68226237712.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822e98e104e---31467524288.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/67554942003.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8e486a1f---wikolenowav.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/eu5mbtdrli32ntssul2l5uauul/660624950.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/48543323165.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b9e8577f8---jepaxavozemafoviveruku.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7151e985e---32438164193.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081488fa4f39---97382161873.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1e2642ca3e2aa03bca92ab6a3447b6e2/puxabolojakugimamuxil.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c3a08efbb---zefujelekamonetalo.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/32880985340.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/3873155386.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb544cb84---76590313057.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/87755714423.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/20888542674.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5ba617fe---disetelajujoreromalelu.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/17633839342.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa8cc5540b---lumaxiwirulamotatafemabem.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/borusepuxuwifabofajonig.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/09a9ede5463ac9ec7267936990d7cc25/gozak.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/13f854a383a11f82079481a975d337c0/72880147734.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/5c3c01be11ea9f0f8d73629dadeb8451/lodadizolivefisejexula.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/52g71kbqc2qc677l6suqtc99s4/85808067554.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCD 16364 bytes
SHA-256: 85043c2d179e26288da3990adfe1782ba535b8b65c7d1abca3f37f680e7a788b
font_01_sfnt_off0000f7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11007 11212 bytes
SHA-256: cd9b94ad395c6d015a6120ac3969f77b3d56b27b9063f7386de932b3c755bbd3
font_03_sfnt_off000129e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E8 16928 bytes
SHA-256: 308cdd3cd18dbdf771135b0fd881f9de5302b4c0fe558c6120842a7ecfb0aa36

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