Malicious PDF — malware analysis report

Static analysis result for SHA-256 83efa56a8c2db21e…

MALICIOUS

PDF

144.7 KB Created: 2021-07-01 12:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8c2d11a1103418c5af388c58d19c980f SHA-1: abeba06a7d0158fd5b04e44b133a9316d16a4ab1 SHA-256: 83efa56a8c2db21e89d31f2ee8f2b0228b0d4a9d6ad1fc65204073c53cc51065
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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 http://kamerton.nl/clientfiles/nejifuzugudopomikepef.pdf In PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2d3191054---35559782079.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/713eb7b58ea1d26cb2883736fbd62012/purevepubuginokeguf.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/56816654478.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/tkj8cbl7lvapo4m1dc4fcchhc1/wupiwanolivabozutilabopef.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc64d01cc86---88710786720.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/64284578731.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b6ec935bd5925d156931cd097dec29c0/84716745065.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d55970ad9a18a7ba3ad6f6439b90fd34/rodunetedugebuwo.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39ad29046e---21458835665.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacd7e56728---figuson.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/73595f532e2a8399b69c1e0da33d0d81/ligekoz.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/51038647423.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/mifogunujulikovoj.pdfIn PDF document text
    • http://sgpeo.pl/users//file/futulafuxojazalufuta.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/fexodagegi.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/xukogeborelixudaba.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f89b4d327ef789f0b4ee7f16ee08328e/18988579078.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/c81710047b51a6802986e0963da0b1d1/salokujalawuxaxuvedor.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/00tjekihkd32rqivq6t87b72rg/pawisizasumudakeki.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859e17a2304---nodovagusugipegisofif.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a93b909458---72540214336.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160797583b286e---94143915521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=in+the+gambiaPDF 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_off0001bbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBB7 16528 bytes
SHA-256: 5d1a3024e04831d430f507f66bcd1c81feca744df8c50f4ce56a2e70916474b5
font_01_sfnt_off0001d288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D288 10212 bytes
SHA-256: ee42c2328fe6569772f58b200e6613a57c18246064d06142ea3f08e13424873c
font_02_sfnt_off0001e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E92C 20380 bytes
SHA-256: 740b4ffd8f5f3fe2c3366e2ec6d807b06b9febe05e8d83f85934821466ec6e17
font_03_sfnt_off00021d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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