Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f67c160b6ae4405…

MALICIOUS

PDF

83.8 KB Created: 2021-07-01 19:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c3226e8ba77ace869d473b9ebbae2fe SHA-1: aff2d85a5f6c625573f84d85074f96e8bf4fdc31 SHA-256: 6f67c160b6ae44054cb99b78382712aba24b3dff5e54dc376ea44726fa7dc16e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=cover+letter+for+company+profile
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d94de121fe---1222490657.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0724180a---27286386338.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0371a2ad3---sezegiziwi.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/1363de8feb1117ce3baa9feafbff221c/bubukevatenogebitu.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/5befacc0f80a516ea1607d72dbcd6849/wopeborinofuf.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5041d9553---serozunevoliputi.pdf
    • http://valsadindustries.com/userfiles/file/gulepiweratopan.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094450d87d30---zadebotezijafexidi.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec360c919c---73132395983.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608647c6daad3---9933677519.pdf
    • http://andrelandberg.com/userfiles/file/pijowalowavuk.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608f038b366dc---45906339248.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c51056304---mezofikulidovutepo.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cbf691e2f---bebobofetowate.pdf
    • http://mea-travel.pl/userfiles/file/69533745255.pdf
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/tubikodi.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/fbcc20ee9266481841f55a442c35e287/reputoperoreduvatowi.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hv9159h3ioh6ne1kinmrtjtpb5/xifuwuf.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e650cb8d---46400229464.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716b87b9b6f---joguvufitemenodekun.pdf
    • http://www.cafeinca.com/img/public/contenido/file/11762010532.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/cge0b9fei9ssnkbg8fdggkf6bp/75988707033.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aad23b12456---lazob.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_off0000e663.bin
54ba7b2637113cd6aedea8ef6cb795645bfa6d8598f5add3c8355239ffbdf43e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 10684 bytes
font_01_sfnt_off0000feec.bin
d90cf3c4f752b867ed2e51e34b197ee5052fcc1b48ad45c3f6c1988b4b7e4428		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 16712 bytes
font_02_sfnt_off00012a12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A12 16792 bytes

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