Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf4f0d89d2a3ab6…

MALICIOUS

PDF

95.3 KB Created: 2021-06-29 16:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e575c0288fb536f4862fb48f8f7566f SHA-1: 2ab5e255ba26f3023fbcdeeb2166f702fbbfaf7c SHA-256: ddf4f0d89d2a3ab67371d6c60a79c3c8af1b2770e5c5594040c73e63fc033712
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites that appear to be part of a link farm, with many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ujqtbqcafnonf8g8gon5degmkj/37116360681.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607e33be63648---66777322884.pdf
    • https://victorybear-info.com/userfiles/files/97326079553.pdf
    • http://busanpc1.com/upload/fckeditor/file/zilepijidu.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08c87bb9c---pawidujivaj.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab490068e9---mokero.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccfeaa7478---2181965932.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/25e0e3ca2830f2f3c18604ac51f1b48e/4035311085.pdf
    • https://soccerauquebec.com/userfiles/file/96248015921.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ffbd9e5cf---jiripevilorefedoleweli.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b2845026f28---44610589213.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/otlm15pt7di6hljqpae0vpuhr8/21799299959.pdf
    • http://accessprecision.com/userfiles/file/45691020972.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/e2lt3k2q0pnfel48ma98bki3c5/buzubazipo.pdf
    • https://mttrasportisrl.it/dati/upload/file/94270791570.pdf
    • http://allprintusa.com/admin/images/file/55314954686.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608f123ca28d0---83572305400.pdf
    • http://boeschfamilytravels.com/clients/43210/File/kejupaxetajifimazodige.pdf
    • http://zonazero.es/userfiles/file/28405818555.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090783f3e8b4---87581407137.pdf
    • https://cgeminfos.ma/upload/file/dukupaduv.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6cf459444---gurikugopulobaritoragomez.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/boragemibogaruzimov.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/pikisis.pdf
    • http://watdoenwevandaag.nl/upload/39698631259.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+many+cells+do+all+living+things+have
    • 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_off0000f89f.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 16252 bytes
font_01_sfnt_off00010e80.bin
97014a6dbac46e0ffae6fc00d21e141732534c9b086532bf822ee61290a6b65f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E80 10972 bytes
font_02_sfnt_off0001279b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 16792 bytes
font_03_sfnt_off00013fad.bin
74f3770c34034ab26f64591f703ad4f4c36eb5becc2d627503781e04966cccda
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAD 17392 bytes