Malicious PDF — malware analysis report

Static analysis result for SHA-256 67df3aeb3b61403e…

MALICIOUS

PDF

106.4 KB Created: 2021-07-15 10:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a4dd7f824302d13f7baef76a30ada645 SHA-1: 8db86116fd98d0a4d4b3408e7978c661b954ee10 SHA-256: 67df3aeb3b61403e6ad3fe047ee20060fef40711f3c7c1bf6fbdb41a1aec8a29
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ofco7khiu326156ju281uugcu4/nupaxufinife.pdf In PDF document text
    • https://asthasupermarket.com/userfiles/file/vurakenudu.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/93629157541.pdfIn PDF document text
    • https://pubgpin.com/calisma2/files/uploads/20649499601.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/98164667093.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/5vdevfbkeeqk91h35rufleopfg/13542877921.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8e02918d2---6533689274.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/bapinewinokamijabuw.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0409e221db---mixozebetufujor.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/51242433699.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160e48709333aa---jipev.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/13364568563.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3987209be---63621221850.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/gisixatezenapinoguzekune.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/31665260031.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e0458037f---betowavanuxevexa.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/5hju0ihaqfgfqt7utm5m5isqu3/vimajagezodavunopomomin.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606effc142161---64421919897.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/todirujemupunobonubat.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/rrbkglkelig89nah8ttbn3ibns/linorumidutotisub.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c5e6784b87aa1cab3f1227e321ae50f8/tazemuro.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/22389470231.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04a1345c8---52688960376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=most+organelles+in+a+eukaryotic+cell+are+found+in+thePDF 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_off000139b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B2 11056 bytes
SHA-256: 6ccc1c48dda6c25c7d6a2ec9b5b4ccf35c368ad337afa0f0e68b8a7bb61b2293
font_01_sfnt_off0001533a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1533A 18880 bytes
SHA-256: 9558768562dad7957cfb989a3dae5c6339c12cbd7b1c752133696c0fea525316
font_02_sfnt_off000183b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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