Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba169be544b7895…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 22:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a16f76751553ccff3a4fc19696fa883 SHA-1: 5b3f171681988e297fa74d3a84ed224ae7ff248f SHA-256: cba169be544b7895354d3b7dce1bdc3313344a5fe7b56133778efb1fab4803a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads, suggesting it's designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the link farm nature is a clear indicator of an attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099f8cae3d3d---sewafa.pdf
    • https://habibitours.net/ckfinder/userfiles/files/33287924175.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804c72eee0d---56854037284.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/4e28r71r88n6rb8r73fj5odkio/jeparolowonixo.pdf
    • https://dalyanestate.com/userfiles/file/96008826848.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4fe79d823---9365312439.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/721f95d88620929c12bc81048697bc17/11720336141.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4eed1453880721fdfc92a3928b0c93e5/51797084722.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877f5934973---garamenusaxawegibug.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/0jua102gng28chf21fs70rlgcq/72452053338.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe433e6220---89959712737.pdf
    • https://alakharia.com/public_html/userfiles/file/51462700823.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/140d02c8dbd5ca89c01749910a240aaf/jerutanalodirefosipowivo.pdf
    • http://turnyras.lt/Files/file/53191628614.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb8e833fe---45537018049.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16070ccca282e5---70568665575.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/2l037rt98ovb5oqb7go92u9pfp/84163531010.pdf
    • http://train-in-japan.com/images/blog//file/12071378287.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160755ae53d44a---3487118235.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b779622683d---zanosuja.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080e5a93b51f---61549105894.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1f3d15fc8---zetokeredasavosuzenaroz.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/k80r7b5q2g53516qmo8t62v21o/90306071088.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b8d28e9a---jokofu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=muscle+tissue+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_off0000ec65.bin
5565eee3975701a00afe3cb78804995e6570fdd9f1b99ad366bbe877765574db
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 10220 bytes
font_01_sfnt_off00010372.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 16792 bytes
font_02_sfnt_off00011b84.bin
ae70ebad5aa43bb441aa19e90a75ac8dd590b677dd941e79240e7f77961c587a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B84 17952 bytes