Malicious PDF — malware analysis report

Static analysis result for SHA-256 8132afd0782a6b51…

MALICIOUS

PDF

92.9 KB Created: 2021-08-01 07:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef154b9ab576aed7472b819a9c86e6a5 SHA-1: 4d2739e3344e3182cf26bacb1839e5a26ae6605c SHA-256: 8132afd0782a6b515c8a7abb0fc8445e525404765b42c97e26f851e393402b76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm directing users to numerous external websites, with several links pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d16e8a1d24---41668409819.pdf
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/450356d4789fe6df3b331d71aedb1241/17312880884.pdf
    • http://praconsulgroup.ru/pict/file/36331271061.pdf
    • http://www.anclupnapoli.it/userfiles/file/5843624284.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b270eaee3---4543238755.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd582935b5---83608301950.pdf
    • http://asremajazi.com/uploads/files/kagaredi.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebb7026efa---telisotivovezizakowopolo.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/h9fk8prohmdc7tcn356ei3clo0/vuniponuwuregadugagi.pdf
    • https://am-system.eu/ckfinder/userfiles/files/51904964914.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0979ca5f6---18536563337.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/610dbshp2a6pqhqb7672nrihd4/38258340817.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/am4e9uqujg73lo6op6i9slcs0j/46218686147.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/8ed808daf4a4275bc9375508a093d3c2/mevoviv.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/toninutumifomugo.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2uda09o5i85vjeo39m6qddada1/4504613465.pdf
    • http://ldbell1965.net/clients/85689/File/toxiwipomekuvodonevom.pdf
    • http://scpt.it/userfiles/files/76407243772.pdf
    • https://epiphanych.com/images/file/27654725672.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/aa157b67154e5953d52bb40faeed8141/vuxidoraliro.pdf
    • https://artbynela.com/uploads/file/41662813633.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bdb6ca0cf---lunegewapoluxelelojogiri.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/5paoqsr8jk41pjr677h7p4smu5/wumatujonituzalidizudire.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=life+application+study+bible+niv+online
    • 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_off00010402.bin
523a1a740bc799acb009f07ed2f55fa7e4b19c8c291936a90d2b32529bfe26e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 18448 bytes
font_01_sfnt_off0001345f.bin
a0f79bb32ec90bc6b1a3004bd25e36bed058c5532fa0e38815a2a05b2545c0e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1345F 10888 bytes
font_02_sfnt_off00014d7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7F 16792 bytes