Malicious PDF — malware analysis report

Static analysis result for SHA-256 6592d519f9291ffd…

MALICIOUS

PDF

129.0 KB Created: 2021-07-06 00:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60129b95085a978a414d33b348dc6f5c SHA-1: 440e170335db00a7c3872ff85b66001ca4f9dcfe SHA-256: 6592d519f9291ffd42f4cf251df0086d402c09bafcb21942cc98635783470244
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm pointing to compromised WordPress upload directories. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution. The presence of multiple links to compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9cmi8a36ebhvemij0otjnouq2g/54452834301.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d621d1ede0---fewobexikem.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/jh0jv08lvrcdab3gptr7j00638/mawesokuduseb.pdf
    • https://sportsht.com/userfiles/file/nikaxiwi.pdf
    • http://casaledellasignora.it/userfiles/files/73863384372.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/82246027274.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b704a38858f---kedopixapolaxowepi.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4b87c279d---sojunuzutivezot.pdf
    • http://meble-tk.pl/userfiles/file/311407775.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/i396qpifrkv4pqbqi4ri31um1u/47141084527.pdf
    • http://chromatographvials.com/d/files/vexonezejakosonabani.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607511b322ff7---40467896817.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/5vgs95ahpf4cbainn2gp0eee20/pijisojivesuxotuz.pdf
    • https://hotel-la-licorne.fr/userfiles/file/jomalokaruxuvavino.pdf
    • http://sarlampa.ru/upload_picture/12872525319.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c89bbce8e5d---80904940860.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8b0572aba---gotulebewemufarajugot.pdf
    • http://otczenacts.com/media/files/xoluvexipeji.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/cdbee40b107caced9eb34b1b454b024e/mumizobabulopober.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b65b16ffa---6994954984.pdf
    • http://classicalgardenornaments.com/uplds/file/wodofudajidun.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099f6f1a421e---megawu.pdf
    • http://thsport.dk/ckfinder/userfiles/files/35558878313.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4d0fe2672cc923d3e7d5e2bd64f18edb/lojarofuberuvolixefuda.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/c140b6973adf38d5dbe983bc656e6cc3/ripededowefadujukejareg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=why+does+sound+travel+faster+through+solids
    • 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_off00018bd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18BD3 16792 bytes
font_01_sfnt_off0001a3e5.bin
300dbdf23c53de79da81464fc4890635017b7a7aed8d95aa7698aeb3583c58e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3E5 21028 bytes
font_02_sfnt_off0001dbc2.bin
4c3971b491bdde4e2bb7b38ad5c209a30032d80b7064e93f61103d9d3c743321
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBC2 10904 bytes