Malicious PDF — malware analysis report

Static analysis result for SHA-256 940120a70418725e…

MALICIOUS

PDF

88.6 KB Created: 2021-06-29 21:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 63633583b6d9b7584eab2128be8ebc5b SHA-1: 6fb55513dcee5c280c301a23439faa8584c3d455 SHA-256: 940120a70418725e312235de48abaf468dfa9f7ebdfe511235d71cd2c6bc3ecb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather as a vehicle for the embedded links.

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://garglob.ru/uplcv?utm_term=transfer+function+to+block+diagram PDF link annotation
    • https://gamaconsultores.cl/upload/file/movol.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882126ea979---bizudupuwatolojobutewav.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/5323fbad281111bb5cf1cb000c41b8e6/fufosow.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6f038f3dd07e6cab6140ca568b6d6109/69972700735.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/6281bda0b02221f06be3648ec059507f/mejewutubogunologij.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/zusini.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/80886653657.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b734322d1---sotibuboduzisugajezexed.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/malufufefesafusoke.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/v6tlqk0nsegmcsj033iarh2sn1/89409807283.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4f8ab64a1e663ad6e4c338c82ba21d1a/58295625594.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/vegolazifetabisikeg.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083548e75590---98969652201.pdfIn PDF document text
    • https://castel.ro/userfiles/file/deserezelokedafiwa.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/3144726514.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/tonezanufani.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/rupilagixukazej.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/66551c722d742e109f54239253ab6a13/92405983358.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/siwesodaroxozune.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dd1858fef---zovamamivof.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4637c28a3---43120195003.pdfIn PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/mabezokaf.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/93593466747.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/fafiz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 11116 bytes
SHA-256: b612dca83f910f032c15e9f421e85cd76f62a3fb7542ddb66889dffb2e389ad4
font_01_sfnt_off00010ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBC 17512 bytes
SHA-256: ad88fc643bb11769dd25304733df5e9eed406f4477858210717480e0bda2cadf
font_02_sfnt_off00013cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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