Malicious PDF — malware analysis report

Static analysis result for SHA-256 561d6e7338fa7154…

MALICIOUS

PDF

89.1 KB Created: 2021-06-12 05:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25c597c768eb25d3a06d27ffbc6ff9e5 SHA-1: c9bd64a14ff9ebade6bbe0dbf14f2c464a364f39 SHA-256: 561d6e7338fa7154ae1b31e8504061e9e0945677937feafc3022b5145188f3d3
156 Risk Score

Malware Insights

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

This PDF document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=how+to+hyperlink+to+another+sheet+in+excel
    • http://dakmet.pl/upload/muxogusudasovuzamebefu.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/2536bcbb7dd5f56071ec7c728e795e1a/miguzojosaj.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aafa94a32f4---jusejeli.pdf
    • https://intrigantka.ru/images/userfiles/file/16396317012.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/6983080813bf1299602c2f604ce46ca9/75582685680.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/8f41f7fa940cb6c25ccdea99e20dbe91/45644015999.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e67619763a8e02b388fd36942d23bdde/bixafobapem.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888f2c7961c---nomadu.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/87312594870.pdf
    • http://accessprecision.com/userfiles/file/86284867235.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/d5c7f78a832e83b2056b06cf1f7ff17d/xivigogoxaredawagovolo.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160afe027cef71---57240346048.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7ba390ec850143f34624524af420dcfb/davinoduxemup.pdf
    • http://e-hane.com/files/5081099207.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/fce881ecd6f115af1aa7bbd2711ac4db/sawepiwutirafa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a5e.bin
e0f6538b1b93b121fa7c63d343187d0cd9443d6ec3eee24fb27817e75de55d1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 5308 bytes
font_01_sfnt_off00012c7a.bin
3237d13386903f18d6684e6c179606d65a635873b68f1a416abf67b9423ec0f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7A 12092 bytes

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