Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac54a4533fa3c9b6…

MALICIOUS

PDF

83.8 KB Created: 2021-06-26 03:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b2aa3b919537f0ba58de99743af6070 SHA-1: 6d731d3d57bdf81effbe7c41eb16950000a5a815 SHA-256: ac54a4533fa3c9b6842231768f7be2928bacea0cf8aba5d6087e4be51f49b17d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://queure.ru/uplcv?utm_term=football+pitches+newcastle
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/3j10vpksp1k90vn0mbfvheet0k/riwazemulezewojodolaj.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079c54a3d4ac---muniwaputo.pdf
    • http://taiwanquinoafamily.com/shopadmin/upload/files/94352994778.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/igh3u1dkqbsdmocuccuerljo46/44866095981.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/bexiruziguv.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa59d9d5064---60151371105.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e355af239c---beposotodaxinusaveruro.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/u6m18odnf6fe4uq7tu6km49mof/69843275964.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fcef80718---dojuwigotilopifuvovemi.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb019086c9e---xiguzinasexuvozuwo.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c3b686e81e35ee0eab5e362310f1cb13/sujasuxojo.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c75a31a65---4252602497.pdf
    • http://shreyaghoshal.com/konadnew/userfiles/file/wapirawazepalugoxo.pdf
    • https://windsbs.biz/files/file/92473696980.pdf
    • http://acpiindia.com/userfiles/file/vipame.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/sanir.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071ece6143ae---91535644877.pdf
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/lenazopavawikinafi.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b50a990f05---94777690690.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608555c964a23---38997279097.pdf
    • https://susta.vn/userfiles/file/fudazoxup.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/emq30rbh1a3lff3a42q3s51q9o/wapataselefubuxumizuxesi.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/184bd21baa76d242f86a6b244458fc52/97840309066.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5541e60d---numovegadulakavowufufem.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/8jluh64fri1qqfef8mfma7il1v/34026527239.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2e189501---kirusibadejifogezu.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_off0000e486.bin
96c2aa90b1101ede9139074c700cbb54f08fafcd430f783ac4608240ef4de19a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 10576 bytes
font_01_sfnt_off0000fc73.bin
584a28cf8d3983e9dceee8a4ccf846816e297e89f038a9e2de42862bda4a9e15
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 17392 bytes
font_02_sfnt_off000129bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129BF 16792 bytes