Malicious PDF — malware analysis report

Static analysis result for SHA-256 3284b9d072ae0d68…

MALICIOUS

PDF

78.8 KB Created: 2021-06-25 23:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c892b54e535052575b7c51e8c4ea2db2 SHA-1: 467caf531f63ba7c8b2281d9c1427a05b20db02e SHA-256: 3284b9d072ae0d6853ab902387edecaf4308c944e7bea8899c8b4e908a7ae8a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to various websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure suggests it's designed to lure users into clicking these links, potentially leading to credential theft or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://allytemp.ru/uplcv?utm_term=subject+and+predicate+with+answers
    • http://adria-ex.com/images/blog//file/23341972323.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a748317f93c---jekakinonabezozoraru.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/dpvgkafvr4emjqhsqhksu0nsuc/66310722761.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd243c6b8b---gizovafatapa.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67267a25f---vizuvabixuwugifexavuniro.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841b108860c---4733380179.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbd24dcd5a---12022417412.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/kebaledaziret.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/dff86b16f02cc1b9130a3a3e440335ab/41147978130.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751e1e7e19a---2482916687.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb6cce4042---figotisumoveri.pdf
    • http://php-lounge.de/userfiles/file/xonulojirugomodanovez.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5da23fb46---fenifobumad.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160afd01c1895a---328953671.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aea2e396955---lefoladewofosiferirefik.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fg42dmu9slh841ujndtk9pmvv4/mawepugiwaluketafufuzudef.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a968595da26---mitekanawitoso.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/wigepobuxezukavo.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/9sgincpgos7b27034dsiql99fk/49806432614.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/jslsnj9icqie9cnd1mrsvprm57/39190183133.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/d7b845a8aa0e850c993a7fe03ae17e69/bugokijufiton.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc9ed60ab---18051525474.pdf
    • http://charivne.info/images/file/59029781455.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/5708a5080bc71a325b79cc8844e91958/megumedezisoxizuvu.pdf
    • http://anthonyvienna.com/sites/default/files/file/21840286204.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a368f7fb2a---mitorikamutarupugutobesit.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_off0000cfac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAC 16792 bytes
font_01_sfnt_off0000e7c3.bin
e7380b209fc5eb151c235750e63ec7aaddff98377b96cef12b8f01babd7813e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 10976 bytes
font_02_sfnt_off00010102.bin
94db5a7113a2315698b3e6b76f1a6a5ebe9c02389f686ca56e0a2b3a072c3245
pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 17472 bytes