Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e80ca4ced44d7c…

MALICIOUS

PDF

84.9 KB Created: 2021-07-08 11:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d83e03cb791fde34fc49010283d01eb SHA-1: b10eb604b28faf73cbf0c1a046270b8ae61f0c19 SHA-256: b0e80ca4ced44d7cbb639a2cf7fc0513241f0c064a8af8c27b716fd75daa3bbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a38b86bd5cfd215aefb94e540a699d06/56022333557.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9e2f747c73c8632f2d9eeed3a411a491/1818152650.pdf
    • http://myappartement.de/web/editor/files/97229784289.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/65757928f7a8303d20234ffacaacaf98/60757685476.pdf
    • http://caudafotografia.com/userfiles/files/lopejolumab.pdf
    • https://ladangmimpi.com/contents//files/35155769449.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097e3c2d1d9d---zizujojilazuzamosukesil.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/480837835762bbf27efb9e644400a78a/40391917783.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/bdd76a897dd080bac8745625fda7badc/74302164566.pdf
    • http://amadpich.com/userfiles/file/daboloro.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/n8kfq0et8l1lsc1jilfal0amq5/pomobejiwejizowug.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8049d20e3b671882e969e9030d7fc671/raketisobuzowavisipof.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/eur5pe3rnu71c5k16261q27nvp/xalavo.pdf
    • https://produktybhp.pl/pliki_user/File/31872601196.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76e855cd4---zisepatilaturoxo.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/108a030738d3d5d7763487705252dfd3/titobegegowemosanurufolal.pdf
    • https://xanbiente.de/userfiles/file/65226911529.pdf
    • http://crmrealty360degree.in/userfiles/file/sejukil.pdf
    • http://rebeccafantarchitetto.it/userfiles/files/kujiwazibusinulixor.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/90k1v1jjjhnuhiq5gcnhe92ro1/94558293494.pdf
    • http://rld-carbon.ru/file/47483029826.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/79739360756.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c335c35ad1b---lanemoz.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/f0e2b8b9ca64bf263fd8d3ef37434551/depobawuzevon.pdf
    • https://red-adlay.com/upload/files/95617156918.pdf
    • http://ski-experience-japan.com/images/blog//file/74129976997.pdf
    • http://51-lq.com/userfiles/file///bilalafunawonisinijole.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=measure+your+lawn
    • 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_off0000eb15.bin
6ed34b7eeeba8dcd68f722bf778140f2a115a03469afd86b74eeb7a543624d19
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 10204 bytes
font_01_sfnt_off00010231.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 16792 bytes
font_02_sfnt_off00011a43.bin
5c2aa7fc7eb7cee16aa738d88cc965a5a0a04d73aec386c5a4f49574ff8a3baa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 16860 bytes