Malicious PDF — malware analysis report

Static analysis result for SHA-256 7611b82ebf986368…

MALICIOUS

PDF

76.1 KB Created: 2021-09-13 09:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62364a9c37e9232d00928af90a7f9137 SHA-1: 643fe63e39699e95f9f5af3f8b5d2f76ba281c62 SHA-256: 7611b82ebf986368c3abfc16c34e8ec231b9cb2a143e9d867a42786c21192d26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for Pdf.Phishing.Trojan. The document functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The presence of multiple external URIs and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9771

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://medvor.ru/uplcv?utm_term=call+of+duty+world+war+2+apk+download PDF link annotation
    • http://coolscape.info/images/files/29842771558.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/80747874687.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d45156c7---povujirirasapomonoku.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/97542637562.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/46523554704.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/xujuwagiwowobejas.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/vawot.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57e86de78925c8c921640354b1f0dd30/46534646555.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/86381971721.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccadd93c47---26800858573.pdfIn PDF document text
    • http://xsteelstock.com/d/files/43974056093.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/sulopebunaxa.pdfIn PDF document text
    • http://forti.in/userfiles/file/13304114147.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/33333240214.pdfIn PDF document text
    • http://artio.pl/files/files/vaxanukojavag.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d663dbe3c7---puxezozejowagubovapet.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/tukifanozopokajo.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/fonigipalabesageserokatur.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/37774897666.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/93348737052.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/60990596986.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/81339207554.pdfIn PDF document text
    • http://holzbau-napetschnig.at/3281125670.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/jigiratab.pdfIn PDF document text
    • https://rinducm1.com/contents/files/48407731473.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/11155877154.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://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_off0000c884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 10640 bytes
SHA-256: fe345d0876015e021f995fcbadae543f6a770f5b706932042f657f70f4593332
font_02_sfnt_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 17268 bytes
SHA-256: 90dd6bc497cd3e0d3f1ef388d3dd84c812a4ea189b185b998b35ed3aab8b1498