Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9767986cb5aeb1…

MALICIOUS

PDF

111.5 KB Created: 2021-08-04 07:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dc2f9297a105384f5d2bf4c498a17e7 SHA-1: 182997b7244e9f571275b8d755b0e2cd51709c00 SHA-256: 8e9767986cb5aeb18071aef89c6e3de3a4bbac5cf84e5b902b7e7b2f7d36ddc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://oniceh.ru/uplcv?utm_term=exemple+grand+livre+comptable+excel+gratuit
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee45715a0d5---bezasebijax.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843fd189b0---18967961813.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f14eaa22e2c45ce9f161a02fdad7f04a/12158923403.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d38be32a---dodutojedelala.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/e07tptfdfh5fdtg0adu9ip6r44/senudikamodizowovedumu.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c08a203856f---nawanevo.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b187eaf9d---suxuviza.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/61470828641.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/90063136927.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/8t205s79sevbu00397nvs22k37/zawafomoxabazari.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e965f751a2---gukorakerebukavovosinu.pdf
    • https://iringmalaysia.com/ckfinder/userfiles/files/45831975297.pdf
    • http://startent.ru/SITE/files/editor/file/80782982194.pdf
    • http://daiichihr.com/uploads/news_file/gozerezuwokimufazebelad.pdf
    • https://ludifrance.fr/userfiles/file/xurezuxotu.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c03cc354578---guloxevat.pdf
    • https://shriramsteels.in/public/ckfinder/userfiles/files/bituzida.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e7f22e514---wewama.pdf
    • http://childconnect.com/swi/fckfiles//file/geniwutavuzanawuzadusuv.pdf
    • http://synfarm.com/upload/files/gasevesesizowubopufibuk.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/259dc234a7c1eefb6c050dc5d2c2312c/sexugoj.pdf
    • http://turnyras.lt/Files/file/81544676172.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013227.bin
193023b61b4e0702446392b340176916a1cdbea9bd040a6ad5b04c81568d67a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13227 20668 bytes
font_01_sfnt_off000165e4.bin
c3c0b6ab8aac6623e6c9dce84b0c02a7ce1208be1e249e4d7fbdb7d1c1dc135d
pdf-font-stream PDF embedded font (sfnt) at offset 0x165E4 11080 bytes
font_02_sfnt_off00017f3e.bin
0b66887e43cc35630d0970669c797ecfbf492bb097841a83f6681a0f5b87338d
pdf-font-stream PDF embedded font (sfnt) at offset 0x17F3E 16684 bytes
font_03_sfnt_off00019639.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19639 16792 bytes