Malicious PDF — malware analysis report

Static analysis result for SHA-256 612d1ec7ee8bfcef…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 12:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad1741ade4b6c0aec6b045baaa1e3060 SHA-1: ac061ea98b9aaa6f86e56763d6a4eaad814df06b SHA-256: 612d1ec7ee8bfcefdd7b7c4038b2a167f3174fabc7be79fc48daaabc3d096baa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document's structure and the presence of embedded URLs indicate an attempt to lure users to these sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=bosch+smv46ix01g+integrated+dishwasher+manual
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/599515eefb2803448a7639f77776f9b7/suxanazufelafiniserereve.pdf
    • https://xistenze.com/files/files/43173213634.pdf
    • http://wojno-stal.pl/pliki/file/juwodifarozuwuneve.pdf
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/12433906416.pdf
    • http://eiak.org/upload/editor/files/rexififivadudojevu.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bd6a05215---7310073892.pdf
    • https://newtop-eg.com/userfiles/file/16514110284.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zefuneteve.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609831f163f1c---kavusuti.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/esq3pcdkueuur1rapn172t0343/44648179184.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/24dc2dab82614dd97000a3d12f7e4a5a/mibawujemofef.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/wefaves.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/nokivasikikawe.pdf
    • http://botosani.ro/img/uploads/file/pukunosifapado.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/92df080b847a364f29fa9ad5a64db2dc/57726179203.pdf
    • http://saydersan.com/firma/files/38620549187.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab06bee3095---49452287393.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/tekufijafina.pdf
    • http://mazdooradda.com/userfiles/file/mizobez.pdf
    • http://mt-filtration.com/uploaded/file/168585709060b7c67c638a7.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098b75a659a3---42041255521.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e88868d69891c39d258d53434e3437cf/tovuduvaporitoferizen.pdf
    • http://medob.org/SITE/files/editor/file/14931574914.pdf
    • http://nomorecpapmachine.com/userfiles/files/16559618173.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/3070d0f9076bee7d1c18e38102f3ee39/99548426939.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_off0000dd56.bin
31be631e4d8d60c6441360f60884b48fd77208c6c0429dfddc8aeec1fbe3f410
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 11644 bytes
font_01_sfnt_off0000f8db.bin
ccc4711c7f598d0c9af9421b35805709362c4cd4ca4960271a927d29b7497854
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 17584 bytes
font_02_sfnt_off000125fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125FD 16792 bytes