Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1bcba8b41475aa…

MALICIOUS

PDF

82.9 KB Created: 2021-06-25 12:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3803a8ed7b5b29494a822b26db64406 SHA-1: 8f8620abb96e6ec235e9a77682fd2a4e63b7c831 SHA-256: 9d1bcba8b41475aa70c8cb68380dc2ed774de3cb2c9ebecf44deed9be64f9786
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crewmak.ru/uplcv?utm_term=find+the+nearest+tenth
    • https://baoholaodong24.com/userfiles/file/31216211994.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607934792a781---62891518252.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6b4ac97e2---xutuxef.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160963df2b882c---sutafopimivevaj.pdf
    • https://tort-art.ru/userfiles/file/66254198923.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945bf95eb89---tazesigogivojoku.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c3620907a43---28885872172.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/aacf14fdbcc18391819b1f74ac4ca2ee/28579111521.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffb328fc5d---26664473666.pdf
    • http://atdawnwelift.com/userfiles/file/35565601543.pdf
    • http://ladyqueen.it/userfiles/files/fukotokumu.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/kogubulivezuxojugezapa.pdf
    • http://kientrucnhacuagio.com/upload/files/22690866490.pdf
    • https://memoservicesrl.it/file/mojogawesinumabub.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_off0000e4dc.bin
2277ffcd9bd88edce7c61bc5565604915c79762d78a84dacc3bfc11c01191988		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 10156 bytes
font_01_sfnt_off0000fb70.bin
e61e93ca1c2be0e682c5a3b8163efef8a13e3bfe480b4a77f06dec45f6d27f2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 16880 bytes
font_02_sfnt_off00012714.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12714 16792 bytes

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