Malicious PDF — malware analysis report

Static analysis result for SHA-256 9432a466138952e9…

MALICIOUS

PDF

83.3 KB Created: 2021-06-28 14:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e185bcb52a7e63f2da0dc4e0b8e9af80 SHA-1: 4226273c8c183df9763a4bd717dcd73171c5dd5a SHA-256: 9432a466138952e9a0409dbd07fc6dd5d6ce35531d1de1e3ed6d3c3432ef937f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/84200553863.pdf
    • http://dom-2000.ru/ckfinder/userfiles/files/62018455908.pdf
    • http://hcvitamin.com/webroot/img/files/31795842406.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/p805tol0l27f7rmgbc4sldfstl/tufelaxorubabatarefena.pdf
    • http://abacusnancy.com/userfiles/file/roxakofopikafewo.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/rabifumigimifik.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/jktl0277le34oe6amvnvtvjlgo/vejotivobilukene.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160994302b4ed3---sepajer.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98765527ee---57942260887.pdf
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/95069232511.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160886768b9896---36203497940.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840e63676a8---kewum.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9ee36b8ffe78e352cca029cdbd56fb59/fawemejug.pdf
    • http://sosnovgeo.ru/userfiles/file/xejofivaxorusas.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/4d3821921270209e0f1cfc54482f7af0/gewebab.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ed95ae91bfe9d3d6ce655c46349f8ca/menidewufakarofumax.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7a6e8252be169d76bb4c0796a97b0904/foxaxojuxomadanitim.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b992e9704ce---97019018639.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/qdda6v69kt3o89bm575krur7g0/wakemago.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2d0327822---83207037092.pdf
    • http://didocrosby.com/imagenes/file/zimomopulaxesiwepaga.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a26ba89eaa2---42710983196.pdf
    • https://adasms.fr/userfiles/file/96555604581.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93efc033c---xetevagixedukinemidu.pdf
    • http://www.tramag.pl/upload/file/78783399650.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=index+laws+subtraction
    • 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_off0000de6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 16792 bytes
font_01_sfnt_off0000f686.bin
8d4eef291a98c75d69436d4bfb0fbf2951b82def430b79e9e3770b0b6c15084f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 10744 bytes
font_02_sfnt_off00010f6a.bin
df1fb74987be84466b7f65622f5fc9c8661594d430750358cd721b8eaf3ab842
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 18256 bytes