Malicious PDF — malware analysis report

Static analysis result for SHA-256 a026bf539f3057e1…

MALICIOUS

PDF

91.6 KB Created: 2021-07-02 11:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72ba2830e96624e2ec9b2e40e6a8587e SHA-1: c96e9f8c1a4aaeed5285a67b49fe8085e1b489c8 SHA-256: a026bf539f3057e130b77bb0a99a5ea084f15e87abdcddf88af9586dfcf28f40
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 installations and potentially disposable hosting. The ML classifier and ClamAV both flagged this PDF as malicious, specifically identifying it as a phishing or trojan distribution vehicle. The presence of external URIs and link farm heuristics strongly suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=gold+in+deflationary+times PDF link annotation
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880905a440e---6926076385.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/nobewupulunira.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b0688932f17---garuranorinepo.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/81014442448.pdfIn PDF document text
    • https://kopari.hu/files/file/48447728797.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd26b25d9a---nuvenozajabamujazitalik.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/17494252490.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/tujoxoxe.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/0f3ae94bcf41292ac87ea41877830e62/20762059999.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/46375192076.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/11763415937.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09e4ec350d---77562929871.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/05ccbeffdcdd419f9cd62e7bc2e4b273/78657149855.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/3ggdik5dg8vjuf7cp52ib0i0nv/mazeniresekojelanujewez.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gibopopoxuwugawigat.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa85ca160---15039396011.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/vcj9d5dmotd4gprf4dvjemd53m/bonizejilu.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/76538395568.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbabab50bc---90688354943.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075f4ceb7813---87785018699.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/de81d7e9b093d36d94b3266136406924/8141234371.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d1faf0bb5---98151171637.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/abda9e8fc8befe0def14bfc136687ba9/mefipanexosaduvijonaxa.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16080789b89c1c---jafuro.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/5f05ebbd260fd9289f90af2db26ad70f/bunefimafivebuwurisakoren.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A7 10668 bytes
SHA-256: df95aaab0e07bd0bb8a16ebe8a3063acb444bd882be5aa24c84e0996bfa377ae
font_01_sfnt_off00011920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11920 18212 bytes
SHA-256: ab0a299f9aa2ece78b20103590c8374c4e2d773d232c2a8716911c3fb370fc33
font_02_sfnt_off0001491a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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