Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25283aa0de5f885…

MALICIOUS

PDF

92.8 KB Created: 2021-07-17 05:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f9554b814ceec41ebe353e8e19488a59 SHA-1: 3dc876787380e75b8d446b8f5d87b55ac6ec302d SHA-256: c25283aa0de5f8852c793f4e67d385e97d72728aac8e6cabbc6f66f985ca44d8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis suggest the primary purpose is to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/kq951oceknv55t19b27vt5id27/kewenawuxabeseme.pdf In PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ehko6cd6nvqb5a8o6h4so7l1rb/turelifafenugotiwok.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/fizitogukewefofaxelame.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609db4361d4a3---susaxilenitoma.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/lkquekpdtalplbq20oo1qrj141/tedew.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/56316910174.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/61214428659.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/47569954.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/76553251916.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/2623211987.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/70487910401.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/fcd6e3cdd76236a0083b4b23a49a7b2f/moviwoxomawobuwuge.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b850d47672ed8c71e761668b1dee3e23/69769957505.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/65936742090.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/megutaxu.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/pobujozemurivas.pdfIn PDF document text
    • http://ponyomaru.com/files/files/91219722502.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/fd76e76d66c5ug6c6dlap06cq9/daderekanorazaxidobebevun.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a859146ae97---retezunu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec52c429024---30294307776.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/95580152363.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/25780909945.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/64579378590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fusion+360+woodworking+tutorialPDF 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_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 11008 bytes
SHA-256: bd66780d6a8f0114ed322c5bf7e46b188719bd68dab53f5d6289453e7a449697
font_01_sfnt_off0001091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001212c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212C 17656 bytes
SHA-256: 6bc9f8cfecaefdded06eccb68b7c25b6a355f16d4d4cbe314fc89ffee90b64bf
font_03_sfnt_off00014f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8A 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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