Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ad4b0e4a0104ad…

MALICIOUS

PDF

64.0 KB Created: 2021-05-24 21:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdb92688b352c213085de75b32200490 SHA-1: 09f7dad18c62a83a558d34ea3a793a6b4e06f266 SHA-256: f8ad4b0e4a0104ad7e3d822e136eea87022d4e5a13d962587a73a4d5957eff3f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous embedded URLs pointing to compromised websites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics confirms the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

Heuristics 5

  • 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
  • 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://pistant.ru/uplcv?utm_term=singer+heavy+duty+4411+manual
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7f108e18ff53f33b6b75188526d94725/45088632396.pdf
    • http://abogarestudio.com/userfiles/file/65775459931.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/mkb36okq48lupvqkk35gnajuvs/26266213484.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6da9e7e51---texudopaxusosad.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/f86155fefcc6d4b16ef00f10bcb3d333/25992279602.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3d7bbc3c---19261524289.pdf
    • http://kapelski.pl/userfiles/file/sogenepomep.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6jnqcd2bouhmarha8tf1n16l47/69513521803.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16075f7701277b---62038120598.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/g21jjie864ocv49odnv974rfr1/zuwulijufopefomin.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/19466953854.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ef72a29c230dac2c894ed27f06d9f7f7/70416642040.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/334iktrvkd1radtscuj3smc9rc/4288368115.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f57431231d---12374264168.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a01fa04939e83c56a54d237e98b6ac06/16543437389.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608327507a2d8---duxedetejeragemosuwenes.pdf
    • https://bojovicsirogojno.com//files/83165670527.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5cc.bin
5ef290366b40670323c892e429a130ebb146e26fd88930fb088de37a29c838ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CC 5464 bytes

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