Malicious PDF — malware analysis report

Static analysis result for SHA-256 3959a7749f454ba7…

MALICIOUS

PDF

93.6 KB Created: 2021-08-18 11:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee4b62223bdfd92946f21dc0a2abebc1 SHA-1: 83c7ea1c1af07b69fcbe6e30af4b1d981e680495 SHA-256: 3959a7749f454ba7ee7cada575a6bd6a31e43c52d29bb0dbef0aac8ae6ff2691
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://castel.ro/userfiles/file/92366211550.pdf In PDF document text
    • https://niboparis.com/upload/fckeditor/files/48496453750.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/lamsuaputdrgr1iop7ogetasd7/99385551130.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/68026667174.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/42933384510.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/0ghc22cjvsdl86ijruo86kl7u4/mubamurava.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088937605777---mezazu.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/8e553a63ff875341b717570a86220b3e/70414275413.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/17092166287.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f880d01a39---gepufuwiwadonoxadunix.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/ludavotajo.pdfIn PDF document text
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/13353156771.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/47482329810.pdfIn PDF document text
    • https://actorconseil.com/files/file/lexopojegu.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/d8944c7504c5f5be78e6a78116eb8986/gemurajopetewu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607415febb953---6406702149.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/mogomezorogowusubakudufu.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/91832085772.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/36052675977.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb4ff41cd2---vafikajipedize.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/22016922125.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609443f1bcd83---wuwetowelemisal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+driverpack+solution+16+iso+offlinePDF 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_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 11180 bytes
SHA-256: 7fcd269038de47046103c25a0ca668e6f58f4ac1f7ff62550255165d749bdb3a
font_02_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 17396 bytes
SHA-256: 5e3d00cabb22705bf827fffba3059ae56cc288036caf76e488efcc88ba59a6c9
font_03_sfnt_off00015143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15143 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878

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