Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d4c3e2acd3a815…

MALICIOUS

PDF

75.4 KB Created: 2021-06-14 00:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3476208b6d6b6a52f9d3bf5c394a1160 SHA-1: d2c8da91736035dcabb22f0aec9f0c21dbda47a4 SHA-256: 47d4c3e2acd3a815ab705938d35d37333b69612972ea787af349c1bb385d7cdd
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing campaigns. No scripts were extracted, but the presence of external links and the overall structure point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://chcial.ru/uplcv?utm_term=subject+verb+agreement+activities
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083075f18e5a---vagusumavokevaj.pdf
    • http://portalcom-b2b.es/img/user///file/_0644773001620660933.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/afe657ddd49bca7d9535293b60a2599a/15273289346.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/262945690d3ceb6a6911d9d703ded036/55700966475.pdf
    • http://vinmexindia.com/uploads/96001332678.pdf
    • https://cardion.dk/gfx/fckimages/file/9180462404.pdf
    • https://careersourceokaloosawalton.com/files/public/76150943247.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096511f9f64b---rinelifa.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/24867799b16a2bb36106b9cd75feeed1/72592183597.pdf
    • http://goref.ru/files/file/30953172520.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/92f3aaa5fc73f167529ef11ae0b4bc5b/kunovomunex.pdf
    • http://kfbi.ru/content/file/rozixowum.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/e58c73b8bdc2377be2aacdd86db7d316/6421359298.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081bd4ae1c19---84160572008.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af6b9b238b---zofitovunamukili.pdf
    • https://fokusmedia.com/images/uploads/95298882441.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7026732db---25594933371.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/aoc6o3drb949ej71ibhdiau0c1/vavinezowiregubusagedana.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_off0000e89f.bin
9f3df376c9cf11fe41cd0187d86a5eaa66a982bd55f1dd90cbca5d5870214c2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 5464 bytes
font_01_sfnt_off0000fb2d.bin
54fc084c37c318f9f8363c016f6541d80efb005f6387bb174b76cfb8d3268c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 10952 bytes

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