Malicious PDF — malware analysis report

Static analysis result for SHA-256 e508cc309b6cbad2…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 22:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90a8a1b12344dbdca443bbb9236ca7ec SHA-1: 7b4793d8dc991aef1e28cd5cfa1409e868912365 SHA-256: e508cc309b6cbad223980b1203a7f2aa4d0db8815d39eccd1cbeddadea551d91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://drafthe.ru/uplcv?utm_term=pokemon+diamond+and+pearl+download+for+android PDF link annotation
    • http://www.hgbehringer.de/img/files/files/95442364586.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/61767037853.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/28914718929.pdfIn PDF document text
    • https://dukumanis.com/contents/files/89653952028.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/tbi2cg0a0qric8b41ng8mnekd2/88263295856.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a414a17e7---rafebidokipup.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/33244463133.pdfIn PDF document text
    • http://parentini.it/userfiles/files/53906401735.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210927003529.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd27e28b06---jofefulobobexekadi.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c6792c22a---51336989991.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/68666619361.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/99236210030.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ac228ce3b---tagojewofoberoxo.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/nevakitunenusawuxe.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/sajizuvikewe.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/siwuduxozakare.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/77591344018.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/17767288209.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/gumitevusaxemakivatanu.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/44974601650.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/gegenan.pdfIn PDF document text
    • http://warehousetraining.ie/images/sekogupogetometiti.pdfIn PDF document text
    • http://napiarsaigh.com/images/31014835076.pdfIn PDF document text
    • http://centronegozi.com/public/46014377844.pdfIn PDF document text
    • 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_off0000b0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CA 15836 bytes
SHA-256: fac737e827b0e2df7f5027be19f698d32372b1aaa526e150f062ef7edb5a8a17
font_01_sfnt_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 10572 bytes
SHA-256: 65e41d932ff0b364f8115815b184e4e5db5ea0e06806d61ea1b602487282eaa7
font_02_sfnt_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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