Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09b3b82cc0eed02…

MALICIOUS

PDF

86.7 KB Created: 2021-06-30 01:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 165871168ab15690c7d0d038e26d4bb3 SHA-1: 0ac9dd0dc7403055510f46810a564dd1692bbfee SHA-256: a09b3b82cc0eed02dd9f247354b9ab05ade68edb23e2314720294cbc3c9f1abc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=empire+total+war+trainer
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f29f484044---dugemizalawesak.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ace17484b09---5550190275.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/f816e43107f02614823e2fa11d72cbf6/12865476325.pdf
    • http://studiofapas.it/userfiles/files/71623389717.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22361ef17---paguvazikaxefir.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe0dc8a622---20809837818.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77fa0f0376---wititeka.pdf
    • https://khangle.vn/uploads/images/files/muwosowavopidegudubumip.pdf
    • https://systematix.pl/userfiles/file/75042661982.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be6b8f23fd3---60995138152.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e41c80bbf---66013628567.pdf
    • http://tetraeng.it/userfiles/files/52941422837.pdf
    • http://pietroquatriniarchitetto.eu/userfiles/files/2662347834.pdf
    • http://pantryscan.com/123cars/imagefck/file/bozelijuwurukuwemugukopi.pdf
    • https://veterinarycarefoundation.org/userfiles/file/81062038177.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/53774007387c830d23e04f6c7bc4c525/71760790941.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609426f214563---xidiwixalagunizi.pdf
    • https://migger.dk/userimages/file/79172541804.pdf
    • https://patc.fr/imagesfile/pixolod.pdf
    • http://huucodatlanh.com/userfiles/file/91971572466.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/goegotju9l6f47s274bjo9dt4q/23779290189.pdf
    • https://soft-print.pl/app/webroot/media/files/mojevogolebejetidalevax.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7972305ced---fodovemuj.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0f20032a---87985095998.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_off0000eed0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 16792 bytes
font_01_sfnt_off000106e7.bin
7130c43588df0e3c12c8f98f1cbcf4208ff43439a41d133133d5b150d53952c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 10316 bytes
font_02_sfnt_off00011e1a.bin
fcca2c5c12c36b5292f1fd8ea3c97a1b6b2cc73e5fa9ed6ef2a1e23a6fa53978
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1A 17588 bytes