Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbd97f3d739979c…

MALICIOUS

PDF

74.4 KB Created: 2021-09-13 04:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ca86dddc73fdb0f30740f9d09a6299e SHA-1: 31247eba21a9d052ddff7ada7fdd7934230a9e38 SHA-256: 0bbd97f3d739979cef775e4bd1836b2bad8b5cdf0b21525e795d567c97042267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous external URIs and links to compromised CMS uploads, indicating a phishing or malware distribution attempt. The presence of embedded URLs suggests the document is intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=pauling+general+chemistry+pdf PDF link annotation
    • http://denge.aero/upload/files/tekixukuximuzirakosona.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/xojozalinowefifegabop.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8b53e2b01653784f24d451f2836d4242/mibasemopunaberi.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/4718736198.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/wilesobenevevevosokav.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161396d5d2221d---65360232887.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/22168261366.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161316e424726c---wugedasajefodigusuwulege.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613335bfd8c2a---64535353285.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c10eaf80a1bf99fc70c061890ed591fc/17491856873.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/39019572286.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/77684271543.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/fidemofa.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/lobixolokarusurowu.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/42517533081.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kewevumufutoxukiwabupagek.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/fuvobevomexitufomapulefa.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161323a3787152---6481377113.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/83103417345.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e98f225c91---33125885768.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/20838979947.pdfIn PDF document text
    • http://poorclarescork.ie/images/tagubanulevi.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/ketaxafopo.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_off0000c099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 16220 bytes
SHA-256: 109954449b278e91a2253885e5f8f91f7849926d95c2a5d85f57d76242b8f53f
font_02_sfnt_off0001023e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 11164 bytes
SHA-256: 8608cb91693e23628ce779f62e744176cd2982011c595b90f348741bacd26516

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