Malicious PDF — malware analysis report

Static analysis result for SHA-256 c458a274832fda59…

MALICIOUS

PDF

84.0 KB Created: 2021-06-27 16:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8edd33ea86a532cf7809c68b7d6455b1 SHA-1: 2703432ee41fd41d8f2b1cdbc50e6c802a14c96d SHA-256: c458a274832fda5913e9128c73c45d92a6f0c00a1b19466b2231893a05116fe6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads or link farms on disposable hosting. The presence of these links suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=direct+and+indirect+questions+examples
    • https://hunde-katzen.at/soubory/zebuvopelugov.pdf
    • https://advantagelic.com/singhania/downloads/file/64815974802.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0cc90d9e---biwamokaxirivumilisulodet.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cddeecd83c---33130821137.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/o5aq4f75qp3keu78iaja1blg52/61814291342.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/2330948ec27363d1eb718156c86e4e01/telizejubag.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3a367ff7d---tutinogapituk.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/fa1919085a2acdc9a9e3eada489cb2b0/18994020440.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/rorsjs90avdtm7qnri04p193sm/vonebabux.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084e42e33a8d---ridedejigonimesozoxuvi.pdf
    • https://afayl.com/userfiles/file/43398176444.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbd467472b9d43f5ccceb0edfc98aeab/ravum.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3907abd47---57589581231.pdf
    • https://aslimitada.com/userfiles/file/80730387277.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/38cf2035c11940dded89c4b83f73df50/39244061742.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/249ff1d67c6c7d84891ea5134893438c/zilabuw.pdf
    • http://goldmustang.com/files/files/musufotawenozarurovivo.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/135e75840f7a3bf975c94d37a2936aee/gigogubitavefuwe.pdf
    • http://aucoindeshalles.com/menu/file/gazosumivabagutojuzu.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/b4p1mq3p06hs6b5mit7lg9f59b/49600357746.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_off0000e3f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 16792 bytes
font_01_sfnt_off0000fc05.bin
fbe4f97584aeb688831612ff54304266d86ccb14625601154dedcd7adab40167
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 17440 bytes
font_02_sfnt_off00012984.bin
aa79e11876f65b9f5adadcac0c7d38ae49fa8631049034cf734e75b88bf3146c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12984 11024 bytes