Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9774c10573fc0d3…

MALICIOUS

PDF

78.3 KB Created: 2021-06-11 05:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 528b7cb31953ccf3cca85467a315fe66 SHA-1: ff1cd435d60d4224078a11b76ea447cffdbf3813 SHA-256: a9774c10573fc0d3bf555eaa783101e69d9f995fa253732100c0e45093ab06ce
156 Risk Score

Malware Insights

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

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

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://ketchas.ru/uplcv?utm_term=number+5+in+different+languages
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cad67c0e3---81597508383.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b727ae2439---solewebavamisemewawijuw.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090b0f25ee8a---19757034765.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e88e0ed724afa7270cffb68805a92a8d/90402209175.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be616cc06ad---solum.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5fa30f65e---92683815839.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb86684e5e---62229252393.pdf
    • http://rolmech-strzelno.pl/Upload/file/67093398542.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bda7051d9f5---30022265516.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a626e38d20f---tulanetajijijer.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/33475660603.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609868e6d85f4---8783460368.pdf
    • http://sam-global.info/files/file/guxaxanevarokulobevanijij.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ecc72aeecf6385f4c0b67191158c380c/53714768000.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a7563a93a04---36876960589.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d4a96160a375267170d67544f5e85556/kumovapunasugigexez.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/aed13d7a35074d9cefe21ec030c65302/51848765700.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_off0000eeed.bin
bdb30a1e9004068af3b284b826f5a83ab958ce227a80efa199880ad7a8351a7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 5460 bytes
font_01_sfnt_off0001016d.bin
70d628c9ff5a3c2ef134455531c5f1ec3f417c0b49aadf44d8a8e6951ab9150a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 13424 bytes

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