Malicious PDF — malware analysis report

Static analysis result for SHA-256 335f620cead95e96…

MALICIOUS

PDF

84.5 KB Created: 2021-08-21 04:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06a76526fc30db94f3b5190ef75d0ee8 SHA-1: 38a536f875659ce0958eb0ef47a4add468da2cbd SHA-256: 335f620cead95e963b4dfb7fa49e0fabc79eaa7f1d0d83e87acde7d8732bf863
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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://inwebjor.ru/uplcv?utm_term=online+%C3%A7engel+bulmaca+%C3%A7%C3%B6zme PDF link annotation
    • http://ozdoby-betonowe21.pl/Upload/file/gatibageboj.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/lukinavo.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/6fc86faa9c604b710c3f4a5d71fb4bea/91583191042.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1524cf68e---36578777817.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/rimoxasub.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f656586d5a---52790551403.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086badfaa8f5---dorexelezekekax.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/65844045757.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a76cbc0b91786548990de948a304c745/30239431117.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aedc1bcf43---28587528107.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/91518759515.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/17342510767.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a80b43bcf2e---defetorojezevaxi.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/wofexo.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wevigawaluwova.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/b4c4085c0264c0d8e643d897578181a8/deropipanapusone.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/suzomikewowemi.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/89250293479.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qc8r0ckk9av2b7an7fgdufeoe6/35715014899.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/mofonewoxilaka.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/sixerewabosifijuv.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a684870b309---ruxukabesojili.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/fecec3bb392291d9aef0daef8fbd1f37/bigazavamunevebigemufiwes.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/lelupexuped.pdfIn PDF document text
    • http://debden.org/userfiles/file/9004782970.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160851a0ddff5c---47949508884.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/lakifubilinetibajemigedik.pdfIn 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_off0000ec82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 16888 bytes
SHA-256: 50a5a15dd3396537ab0a42e6e7b61bb8450c2256edc8fd12773b08597042d416
font_01_sfnt_off00011899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11899 10824 bytes
SHA-256: 346b3507f035ae5e37c80ef6ca2d2c00124671a657d360566a9aedf15ff38088
font_02_sfnt_off0001312e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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