Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b16defc6e33f4b…

MALICIOUS

PDF

69.7 KB Created: 2021-05-20 22:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a68b869dec30db891aa26ae71798f4d3 SHA-1: 4496418581cd9f5deebf299575fc16b3f986cbcb SHA-256: 70b16defc6e33f4b8cc1fa2c9a45041b7beabffaf0acade31c4395b7de409ad9
156 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that lead to compromised websites, likely intended to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though partially garbled, suggests a lure related to specific search terms, aiming to trick users into clicking the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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://smidgel.ru/uplcv?utm_term=grigori+grabovoi+say%25C4%25B1lar+eczanesi+kitab%25C4%25B1+pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/cfa8629f086a7e5a7409bbc14722df11/sobaledetarolifojodun.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079275ba194b---32224241578.pdf
    • https://communeouchamps.fr/userfiles/file/46244993996.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797f1f399c4---21685474787.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/92974314315.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/kr76lukdf4ei51vslmussldu9f/29680365639.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a1b850deed2a66fed08e9d031225eaa1/xebokukovujubezupozove.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/3ad57eea522fab3dfb2abf593fc64fc9/popavaxipezila.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a34ec1ae336---nudovinosase.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ar5j8f4qql0tqkncj5olbb4dk7/87638790718.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/e1680rrvabchmertrl2un67ju8/zajivisulirufisir.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ju2rb6r0nl2t8ov2097t39gt4c/1728730164.pdf
    • https://a2designbg.com/userfiles/file/domerotizumemejinedobe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d842.bin
699fa20988f102fe1fdae350a80fec5955273aeb48dd7d4d674874dff29f6938		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 5800 bytes
font_01_sfnt_off0000ec31.bin
e4913c8838db17f7bada4263857891dae466b93a12c8752a55bf26e7a1c83ec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 12296 bytes

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