Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd8dda380bc6317…

MALICIOUS

PDF

77.7 KB Created: 2021-07-01 15:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a0d184dd6bfe38d41c8a621ce901874 SHA-1: 35c4bb35bf465ae778fe06328af08981c458d1d0 SHA-256: ffd8dda380bc6317ab73d22a8fed24b9a1b28b099aee2d34f9d8a2385ef69bcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the link farm nature is clear from the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://garglob.ru/uplcv?utm_term=textbook+of+dental+anatomy+physiology+and+occlusion+pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a1e0e074f---30751882042.pdf
    • http://alarmy-kamery24.pl/userfiles/file/92773905310.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e140ed97d---41210834277.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7e3309f7a---80365291331.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c631d067f1c---sorijuxaruralabe.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/56269599700.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/hgip6tfthtin2t9rbk9nqnuk5b/juxabelobofusi.pdf
    • http://ccforum.kr/uploads/file/1622885531.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a9b8f54814513b247d102bb06e3001fd/75107782259.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3489780470---zaraxoz.pdf
    • https://bravo-hk.com/userfiles/file/dawudixiwuronivogozok.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4f96c01feb405334c28418ef0e96855d/864529056.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/686f7e27ee69c8f0394d52855ef9b3fd/2841301132.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db5fe9786e---82430899022.pdf
    • http://hndgyl.com/v15/Upload/file/202161476137546.pdf
    • http://koszyczarek.pl/userfiles/file/61765503364.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a318156925a3f41d95fb41ffdf31071e/jebixiwagivizumoruzi.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a7c26108---25276860492.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fgfl7davc21f7b46b2dtrlag33/68195110688.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f530690373---koluboxivisamolu.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b65352ce4---15410728328.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/453680fbc092347e7b1c37ceaf7bfe7c/lidujug.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caa5.bin
26b7fbd523f215cf33267790ded1ca0395388dfdc06637c26408229578059d15
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA5 11476 bytes
font_01_sfnt_off0000e543.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 16792 bytes
font_02_sfnt_off0000fd55.bin
c915b6b51977a97a6d8d82d64b4365bf959309b197bbe83dc27e71487ca665f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD55 16772 bytes