Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcebb6a6a6c43e8…

MALICIOUS

PDF

95.7 KB Created: 2021-08-20 14:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 962fa754848b156b13c61cdcf0b17c21 SHA-1: 8eb3b68282555b96f247b8f1208abf4fc985e09c SHA-256: abcebb6a6a6c43e8dfc14ccc70ac821bdc0b852937005273899481f44f07a7a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is a primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ketchas.ru/uplcv?utm_term=what+is+diaphoretic+in+medical+term PDF link annotation
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/nj6814pug438mrb0ha7pb2hs5d/regelirugel.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/xizeki.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/cf988ada5e37daf8a6c256f0b0e85633/dibuwa.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071feac93ff4---51008798323.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/15032376872.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44539b2a70---22439512428.pdfIn PDF document text
    • http://attlas.center/userfiles/file/34464401997.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/48498614203.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/71ed76e082d19d192c72a17f3bc6fb66/kikiwine.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e1e148173---27982494059.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/edc0aa0336ac45e92270a449b9cfea25/finevezasoduxojapixulize.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/tibeterofa.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af72d1550f3---63917408165.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611517e1a50b4---92373803716.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/9d1cfqb9boeufbsl0oas6smgfj/16237167916.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/29945508469.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/48947586069.pdfIn PDF document text
    • http://guchenes.com/d/files/87948384305.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/gubixabefosi.pdfIn PDF document text
    • https://vitanov.rs//files/43824999515.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/45130807821.pdfIn PDF document text
    • https://willes-gb.com/uploads//files/202108120453019716.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/71214409222.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/zaruguwanatunemef.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/1fd5a4bb081356f7a872765ad64dfe4b/gasomodakazavepuloves.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_off0001110c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 17632 bytes
SHA-256: 33b45cf80ebb3aa9731dec01e01deea79a334f2fd1910ebc3737e936d9dd7e69
font_01_sfnt_off00013f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F24 10772 bytes
SHA-256: 7b334e0f37fa480bf3859d51c4650cf5b6ee92d6a0ef3639e414d2b49767c625
font_02_sfnt_off000157bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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