Malicious PDF — malware analysis report

Static analysis result for SHA-256 01843f0debe0d476…

MALICIOUS

PDF

81.1 KB Created: 2021-06-29 19:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 140bc0c549dc2f394b11e6eb9c0281c5 SHA-1: bdbba5172e229df07bcdbaf64c1ee09db53b80c9 SHA-256: 01843f0debe0d4768f730d4a0c1fdd70c166a1bcf70244d9371228a9a0191b36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to compromised websites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://synerhu.ru/uplcv?utm_term=exam+answers+funny
    • http://stlnsk.ru/uploads/file/bomenomawiv.pdf
    • http://boxethai38.comupload/file/rafavekususawatav.pdf
    • http://inhome360.ru/admin/ckfinder/userfiles/files/fudunotabuzewekadev.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607700792d5c3---81572256001.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/fejukibod.pdf
    • http://divorce-difficile.fr/userfiles/file/25091079380.pdf
    • http://arniestribu.com/campannas/file/nisonupisonage.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9d2bd9ee1ba0012415d5b815a156ab81/22776089276.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c7e347ee9---tilakuzofodakupawobal.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/0ce13fdd0b57ed2fba8b90c06aeea2cb/fexid.pdf
    • http://globalquestconsulting.com/userfiles/files/muxebip.pdf
    • http://baloneacessorios.com/_upload/file///worefewuzusuwixovupesit.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4e89761a059d8789efd1f88f110a9012/xelinasirabesibefe.pdf
    • https://auto826.com/uploads/files/88584517606.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1144b17f1440c6d838fda8e35a55c47d/komojagakuzaxilazategel.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160877800f0d80---xejadekojalekasujazudad.pdf
    • http://ms-krmelin.cz/app/webroot/files/files/22065741478.pdf
    • http://essiac.cz/UserFiles/file/jogopasuzijivif.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad650de2a1---lojagokavipasen.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/jc3u2nmgbb5o1kf5p3krb4chlk/zexowodagizutosivedevari.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dda870745---42522250365.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae4dafb77---17766205610.pdf
    • https://etadelloro.it/images/file/59315634097.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/tifubededupalalowuxu.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf8965081---kobujewor.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db97.bin
23039169508cae3cabba183b3797d339b736e824491f6d98cc35989f31f41f78
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 16876 bytes
font_01_sfnt_off00010793.bin
96d11281d9cdc552059f08aa5246d6e764feb7b448c203887e85c3107717b22c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 10404 bytes
font_02_sfnt_off00011f27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F27 16792 bytes