Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d914dc43f676153…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 06:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3919b84bdaa2a1ba8b83e3b82cdeaa8 SHA-1: ef5c78174d06d29b3bbdd1b3fce3664ec2572089 SHA-256: 0d914dc43f67615324f27b5660192a597305d935652ee0149fb4c8ac10d0b9ee
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely a phishing or trojan delivery mechanism. The embedded JavaScript is likely responsible for initiating the download or redirecting the user to the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=babumoshai+bandookbaaz+full+movie+online+watch+free+hotstar
    • http://le-nora.com/userfiles/file/milapitunapenomobijota.pdf
    • http://www.hydro-tg.pro/upload/file/mimakokegotelituf.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/gg3r29id954jk0sistjd1634a6/25054646586.pdf
    • http://xaydunghoangthanh.com/img_duhoc/files/83447707554.pdf
    • https://healthmatters.me/userfiles/file/vokewojapipewim.pdf
    • https://dakhoathienhoa.net/images/files/49988249542.pdf
    • http://www.veslovani-vsb.cz/soubory/file/86024032492.pdf
    • http://cappellastudio.it/userfiles/files/88212927675.pdf
    • http://at2apigroup3.com/contents/files/1092132655.pdf
    • http://mea-travel.pl/userfiles/file/dezevezijurufarejoposa.pdf
    • https://holcom-solar.com/webroot/img/files/4288316255.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6dd2f3c7---teguligezexujotox.pdf
    • http://proxima-design.cz/files/file/durenugizumi.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a0597f5c---23323719279.pdf
    • https://birudongker.com/contents/files/kegeronotezinuketapi.pdf
    • https://borgopitti.it/userfiles/file/palidumilis.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161438ef081912---vepinivadora.pdf
    • http://amandatour.ru/js/ckfinder/userfiles/files/59492455240.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/173b972c24e759ea0ff78bb0bdc956ce/rukaxezusi.pdf
    • https://cukimentescukraszda.hu/files/files/76036784843.pdf
    • http://shipsupply.ru/userfiles/files/30820954984.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136c66c16c8d---dalovogamezagijenunisuf.pdf
    • https://franciscojaviermoreno.com/DocsCKeditor/files/75826972175.pdf
    • http://opuspointpartners.com/ckfinder/userfiles/files/vavaxelovinebukijiji.pdf
    • http://studiocinti.eu/userfiles/files/venijitexutuloruze.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_off0000eacb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 16792 bytes
font_01_sfnt_off000102dd.bin
25e98c0fdffc2a8d282fee705a90fdd9d713fb687703a7ad972c6c763d42df35
pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 18240 bytes
font_02_sfnt_off0001322e.bin
1bcaa903a28616393c368121a72dfb9ba20638187e23c7456829b37b69039931
pdf-font-stream PDF embedded font (sfnt) at offset 0x1322E 11336 bytes