Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7e8e74c6a922b1…

MALICIOUS

PDF

72.2 KB Created: 2021-06-25 14:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5dd1dcbbe2e445316b9e9f5e0311cad SHA-1: b3ad1cea1b1ca17547a81b9bbddd8e2855e18373 SHA-256: 4d7e8e74c6a922b1142903f5c0a70c5709c4b61c519d5764d014689b0679a10b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDF files. This suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, and the structure aligns with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae069a1131---xilaxitomakinal.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b400162d---resegujifepudigitep.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6a0ed05f1---30233350638.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3ac07222b89b124fe4df0d64638d4b83/27994394117.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf13cb4ca---gotoresagokixoximolojono.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37723350e---30418985070.pdf
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/73940809875.pdf
    • https://a2designbg.com/userfiles/file/87044062193.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cd574149de1---20152367552.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff0cd8bb08077b0ecdfd3391609591a5/36041750549.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/div7ftummfvk3sfaa737gl6kig/xemanawonomad.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20216201138219823.pdf
    • http://worthingtonpark101.com/userimages/mikadibenexamigunagupiron.pdf
    • https://clifestyle.net/uploades/userfiles/file/nikulojanakelisu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=you+are+god+we+praise+you
    • 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_off0000b8a3.bin
1e9725f7f6c33eae32ec2bb697c03f3e6e7e11e507efacada4af76b21f2fb2e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A3 16812 bytes
font_01_sfnt_off0000e468.bin
bf0e540ba73088e4192a46bfbb095c73d00f23ad5f0fbe297ae080aef0cee741		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 10600 bytes
font_02_sfnt_off0000fc95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 16792 bytes

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