Malicious PDF — malware analysis report

Static analysis result for SHA-256 169a9bf439358eb1…

MALICIOUS

PDF

83.0 KB Created: 2021-08-16 17:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03e450a28083e3aebb168b9a0786ba9b SHA-1: b31bc7007ce1553900a6adc717eb814eb6f20c5d SHA-256: 169a9bf439358eb11e3142c793cee8fa1bc191d124d9b76eaa967c1fb35581f1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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 http://centonze-vini.com/userfiles/files/wovevopuzavixem.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161097c2398475---gonigogorijan.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/q4qhc1kjcm05elchc37gih905q/sifezofavizev.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c407a416ad9c4838a0e340c06f44cf04/voxitixegikoxi.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0103eb828---31581945675.pdf
    • http://fouladsazanco.com/Upload/file/19877919425.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/de7661441e9a7c5d2e8ad1130241e4ad/wexebibalodelu.pdf
    • https://ludifrance.fr/userfiles/file/modupedusejoramexod.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adcb1316e8---liwenabonanevajofavoreg.pdf
    • http://www.sm.ac.th/ckfinder/userfiles/files/luwupubepunetubepogutujuv.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b72ddc7ed3---99031263066.pdf
    • http://timnhanhonline.com/upload/files/xikakowemukelojenu.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7381502320---vatidum.pdf
    • https://havanic.com/cache/fck_files/file/12635264234.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867a594f7be---29212658893.pdf
    • https://africanresearchcenter.com/userfiles/file/lirosawesanigajuxunozupot.pdf
    • http://alpha-cp.com/userfiles/file/silusamepabato.pdf
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/51447463822.pdf
    • https://muacash.com/webroot/img/files/65066559728.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ffd44e75e---keboxinewipelufaworeva.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/72884213642.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/mld1034l4kc1k53hf9cm0jb10l/soxovejasigasobonudotubo.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdba717e5f---fijuwarogagugujalujujitip.pdf
    • https://er-cardiff.com/eurostyl/photos/file/bavivutotolosibel.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+lomotif+app+for+android+phone
    • 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_off0000e2d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 16792 bytes
font_01_sfnt_off0000faee.bin
734347f84b2e90e1ddad61a73571fc5ace34e072d1b7d6fd920faf0d7bd06b7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 10680 bytes
font_02_sfnt_off00011330.bin
e764511b8b87bf23b236cfb20955836c3bfa66e24c20cebbb35dd0437e9560e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 16744 bytes