Malicious PDF — malware analysis report

Static analysis result for SHA-256 e666006012cb639a…

MALICIOUS

PDF

88.5 KB Created: 2021-06-11 02:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: de0223c6b8e54b025e93e3ee50ed0982 SHA-1: d8c95993a803e1d87db7d386bca4098d6c93bed8 SHA-256: e666006012cb639a4e44451284e11a006bb4f55a69a80137d400dc84df3e4ff2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many 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 malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://krisoc.ru/uplcv?utm_term=bahubali+2+mp3+song+downloadming PDF link annotation
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d223942c18---dulerutomesavotap.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/nukupokavunupelonesu.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/laxarebezotosedas.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/8245459912.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607acdea70f5e---59928306516.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f27aa439415ea4e17f439ab6a8407753/202062715.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/79297196355.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac26254a802---juwugubowup.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160721902a7d0c---roruvekinugafak.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed2b51ea2b---mepefofosuruzobipizij.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/52837647967.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1ff60544bd204768dd881fffa0178639/xedotegane.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a853b789e61bb6f7e5be310cdf48ba48/81838038344.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/45892919684.pdfIn PDF document text
    • http://www.heksan.com.pl/file/81670020101.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac27a26b256---55139579151.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 5856 bytes
SHA-256: 613f1e5b8d95446af5c7ad71b2c8f4cb2eb3b9ebad2d8eadc3ed83db6e49871b
font_01_sfnt_off00011915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 11156 bytes
SHA-256: 498b838f4042497cfb77e2e3e27fcbdc4c28642892cfa9b740879f1952c99fc4
font_02_sfnt_off00013f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F59 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e