Malicious PDF — malware analysis report

Static analysis result for SHA-256 66799ec3f2a5f0c2…

MALICIOUS

PDF

90.0 KB Created: 2021-06-29 16:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 486c390694044700baa549e1cb8b628d SHA-1: a08254b334926cc64dbb71cb1c3e63bcc8f1ca72 SHA-256: 66799ec3f2a5f0c236a29b6a7f9d20483066e1fa3cfbab36f7f0801e4d1c6e3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of a link farm suggests an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=how+to+make+a+working+water+elevator+in+minecraft
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/08isd9el36c1b8n4pviutlablc/33522828475.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/cdd2ce3c9af1b6e05e710802e9a89db4/43275234164.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3aceb8a18---67464377825.pdf
    • http://abpaluso.com/upload/file/80482697505.pdf
    • http://sosnovgeo.ru/userfiles/file/jozev.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/dba9ca1642c7ae6b10efc98cf0699ca9/72040047437.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/kajuzuwavoguzetamezaxowe.pdf
    • https://dalilak1.com/userfiles/file/xisepawezopa.pdf
    • http://thepokeluau.com/uploads/files/julubuwopiwabeboxilafu.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/0a82be55e14535b6b381326648e5dfbd/suretugifezexasuvodi.pdf
    • https://blokhol.com/upload/files/zureluveveravebewa.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2ebb1744122d678dfda051d6d47f2f5a/16696361997.pdf
    • http://119hero.kr/userData/board/file/raxakum.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f96192ec25bd66600ff71cd5ae9c798f/63072005132.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b579eac4293---rudutoti.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f24964706---jerurerevurakaxexilod.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c8868313092---gujemuwelogikuworez.pdf
    • http://apgindia.in/uploads/file///jifejafu.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/d1695f039028d16e621afd33d3973088/12383710000.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3484e6f5d8---75768774913.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/kdi93mqvpsvnku3vupmih8hvm6/kewopinuvubexutegale.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/f10af305153d8c022e5a387011923195/xaxotabefogerisotaxokapan.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160908c5292ce6---xugekazawudedote.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_off0000fd42.bin
4357f1b262697c7487344a1f50000e5a2443401ffffc617c69fa753361100d35
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 17608 bytes
font_01_sfnt_off00012a6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6F 16792 bytes
font_02_sfnt_off00014286.bin
539497858330a3c5548f21a40448cac403725f6021be563659bdffcf02c7efd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14286 10748 bytes