Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3de212df4c6d97f…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 03:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b482524994b0cf32db12f68d2105f88 SHA-1: a73f726da72673a1534a6634f6d445838c3a1aa5 SHA-256: c3de212df4c6d97f3f159d624f0e73777a44a69b6d22fdabdd3d39359fe069e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting an attempt to lure users to malicious sites. The presence of multiple unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e61c462fc806eb8b89d7fa5bdba7ea1b/jujew.pdf In PDF document text
    • http://odumakus.com/uploads/files/kinonateguzisix.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f411c914d---5742953927.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/88071191924.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/batasikubeg.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f3e861211---10381942795.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/37500520839.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/gezabo.pdfIn PDF document text
    • https://fong-cai.com/upload/files/wotokebejexufozir.pdfIn PDF document text
    • https://smaransaving.com.np/ckfinder/userfiles/files/13733077978.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/48371517952.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922538107b3---18704864280.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/kugaratusewo.pdfIn PDF document text
    • http://one9five.com/userfiles/files/43938521878.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1d984amv72vb528gkbthbjnkb7/logivuwavakatoge.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/98918867404.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16099b7a9c4c5e---zotipekov.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/2630865488.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7ea6bd4d4a1c9b83e2f977c3d09c6cb6/leriwosi.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/37115985054.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161299224b9287---nudalido.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49a9e70d49---kifafatabiwut.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/26879404749.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/fovisod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=free+roblox+in+robloxPDF 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_off0000e854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 18244 bytes
SHA-256: 6a7f2e79b3f32a0899315b79b24fb729fd54a3746631cf2d77fd4f0b0271f3f2
font_01_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13009 9892 bytes
SHA-256: bef90466e10224401a1068f8a32255c3dfb166e4d0c4a472f4a364003ce634e2

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