Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0491d9caf4ea84b…

MALICIOUS

PDF

103.2 KB Created: 2021-09-06 16:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 19fb2cca7d24d2a08a53144637b97e67 SHA-1: 17c52f0102928ff955af4bc708b3d799123e00b8 SHA-256: f0491d9caf4ea84b931285e310391002367788ae71b073b172fe997368cc9762
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=the+cherry+tree+by+ruskin+bond+pdf+download PDF link annotation
    • http://latexindia.com/userfiles/file/jezalekusugoro.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210824_FA6A9FE8462473BB.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc3692508---18164412001.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/35096647181.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/vn2i2pi51vnjh211ugca9lb7s5/87636462608.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/denekeva.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/suxumipozoxozosobej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6eb1a5f5f---zusibawisolofumami.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf679e27dc---61274229396.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2495dd3863---vokisibe.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/62055215137.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d867ff002f0---nodebekugulofosop.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/9ssosl5kq15pnqek0u90pa6rj3/toxatisizon.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/312035ba3c7d52d99f4ec3381663e061/96286373796.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/db0557e74c4bb07a3e4b39d583a2e2aa/93993416130.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/11782349484.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/78535610341.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/22797465831.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/towufawowize.pdfIn PDF document text
    • http://mosjob.ru/images/file/85932794448.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ea2c5d3c118a0f16709e75f0fc914fe3/71696996488.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/figirim.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12969 19520 bytes
SHA-256: f45c79d0b0b7d5c6e684171921c24d0c9716de981893f3886ff398c7bb89d5c6
font_01_sfnt_off00015c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C86 11212 bytes
SHA-256: df977773ac9205f281da3e1f3c5de639c7ec097e740fa5be2e078a1fc0a5f3e9
font_02_sfnt_off0001769f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1769F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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