Malicious PDF — malware analysis report

Static analysis result for SHA-256 3373fe9fb0b80edd…

MALICIOUS

PDF

80.1 KB Created: 2021-09-02 09:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 897885da1e80c0b25c451e2f04a231c4 SHA-1: e4ba9463c780fe221ea007ea9da7a3bac41a5826 SHA-256: 3373fe9fb0b80edd1e6a1ba0d1a05c8df6e9abd8398d1a88ee13f2bb62e19209
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://domholidays.com/userfiles/file/84676882439.pdf
    • https://cityface.cz/res/file/71976563335.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/20c95b89665aea13923826ad8d9d4b3f/nujotazigojagoto.pdf
    • http://www.bash.cl/media/file/muberojixejetopodewiw.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00b2fa2a36---mokum.pdf
    • http://abwrichmond.com/uploads/files/gaxuw.pdf
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/jagogoledanafifopaga.pdf
    • http://pharmorgsyn.com/upload/files/sibonilirotitusubuva.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/jitivamodizepos.pdf
    • https://mundolibre.cl/uploads/userfiles/files/podum.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c95d31111---retalomenaduli.pdf
    • http://sva-jeanroze.com/xmedia/file/22501952393.pdf
    • http://gfzgt.ch/upload/file/63173449875.pdf
    • https://theipbuzz.com/images/file/juwit.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac497b2c81f---42090370022.pdf
    • https://hanahana.vn/media/ftp/file/japalutopazarewefinoz.pdf
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/wipunonajivigefinin.pdf
    • http://quangphong.vn/uploads/image/files/gimukelufamatuwekotimi.pdf
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/4432860715.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ce2e03d91---43534960338.pdf
    • https://eltonltd.ru/sites/default/files/uploads/82372772911.pdf
    • http://phrabat.net/UserFiles/File/27479058529.pdf
    • http://beiks.info/public/file/37777425295.pdf
    • http://www.ocptecnology.com/admin/uploaded/fck/file/92529898611.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=speechify+for+students
    • 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_off0000d580.bin
5a1581cc59f625bdeb068c03e8e57965051ce779d65816d3fc38b85819b86a69
pdf-font-stream PDF embedded font (sfnt) at offset 0xD580 10796 bytes
font_01_sfnt_off0000ee5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 16792 bytes
font_02_sfnt_off0001066d.bin
cda807f3fcf1302a1d5150fa8df877e949d3db0efe8cb3c48cb1cfa5c8f3aeaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 16772 bytes