Malicious PDF — malware analysis report

Static analysis result for SHA-256 be447cf69cc1bbc1…

MALICIOUS

PDF

79.8 KB Created: 2021-06-25 14:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bab6cd149c34454579a9e12a9f6412c6 SHA-1: 98d889ff404b1e6e24b50cba6d45723cbf51f741 SHA-256: be447cf69cc1bbc19701c6eb3205d413d724b7f0157108733d6f023a2665b413
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it's designed as a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution vector.

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://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a1a5171d---1996534880.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/gabolosoburovimakofezi.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072c01d8dd9f---miwetotu.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4344154fef---fibevazozejosomotamore.pdf
    • http://e-hematologica.com/users//file/xivuwose.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16088b7a39ef71---mojarilalo.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bce94a3f3---vujinagopofufe.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8edef285e---52160474427.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c774cbaad9d---26391485454.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31f3e7ff06---618279224.pdf
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/durunem.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae8be59c4---41145703324.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4764c826c---zijoda.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/f44dbb81c52b44815e78aa70a322b40a/vovajoj.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707df00b481---8402639940.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=license+plate+agency+boone+nc
    • 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_off0000d662.bin
cf1c05c589d77ef95b3e042bb4fe9d300b57f53304b2c3ff14e79ec3ab83573e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 16932 bytes
font_01_sfnt_off00010283.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 16792 bytes
font_02_sfnt_off00011a9a.bin
bd027e04da933b43e7e68a4d1ecd68333eff317bba0c0e64a2803314c5923219		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9A 10660 bytes

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