Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e25bf720977b630…

MALICIOUS

PDF

83.1 KB Created: 2021-07-20 23:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a433953401be9cc6743ffc4b89fe9e77 SHA-1: f031d1acaa553db085424d8f531e52158a16b8f4 SHA-256: 1e25bf720977b63090d7c089c96ca8da670757054a4069cf0d7ffd9eb68a2569
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the attack pattern of using the document to drive traffic to potentially malicious or SEO-abused sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a04c2e2c7b680a2992fd2d543446aa5f/kilabinu.pdf In PDF document text
    • http://alemotta.com/resources/original/file/nimejabatepabewuxaxip.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/43854667591.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8c94aac8---vitopuvumojuselaji.pdfIn PDF document text
    • http://gtshotel.it/images/file/38363953891.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ldbrm8js9ondl0i56l7kgmiovo/56290490966.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2m7irmv6pn247t57onr4ca58m0/labexoroxowevag.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/1aqepm01r244kulhmla1l20g04/tezunux.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb8e837bae---ruwafan.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/885f3cb15ce610faef1eea9c86260a27/xofojexigur.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/38597815462.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/db4tm2j09li990lbi7qmq23u2j/xowofonevefifomovikuloras.pdfIn PDF document text
    • http://centurionim.com/userfile/batiment/file/tekunoxifobuvugo.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/761962c86d5382246a2ce3a3f645cb2e/57816532681.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/b825be5c8868e70ae4f95b293a74e583/mipivuwazirikupupisoxubaf.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/13634319135.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/dodarum.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736fef7f41e---runotezavufewiponib.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/pozilokitumikosefej.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3urh3ith668hgdslutdfrrg489/kekoranuwer.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e583cd37df5---vulosewejovi.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fc2546487---subak.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160722cadc4718---99341016326.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c06dd961d---94129158519.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3u2mo8ai7044trfa9rleuucgs7/55543933927.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd9dae1de8---78260813873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=commercial+building+electrical+plan+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 11064 bytes
SHA-256: a5746d918a2bb8eea7a026e894f53a8f1322c50031f6c9e88b8fb115d9d2206e
font_01_sfnt_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 17564 bytes
SHA-256: 0f571638e4332195daa61f045515f87f629c395a2a39d7502ae706b5b725da3b