Malicious PDF — malware analysis report

Static analysis result for SHA-256 9491d9ad7a0a802b…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 19:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d5ac7be3a460e5d4fb3fef39e93bc500 SHA-1: 867f7e5fa90fe37060114577eac4b4111c612ac4 SHA-256: 9491d9ad7a0a802b29bbc0ad9a0769d2aacac278c487ced5843174c8b51b6184
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or scam lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/uplcv?utm_term=sexy+with+school PDF link annotation
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614f00d88ebf0---sekezowawizanovepu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161392340959a5---kenitis.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/80352307335.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/kgauje3sqi3ri16c9oqkdgpei5/14156444605.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/4212769712.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/48553240210.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210923_080249.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/sotuvoletaloluxotada.pdfIn PDF document text
    • https://beautydent.hu/editor_up/66373217875.pdfIn PDF document text
    • http://videlec.be/ressource/file/falobinafidasomap.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/28308732839.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/lanugerapokigat.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/20203523761.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/jumomivupupafenejodo.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/dufewopiso.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/34089159428.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/luxakolenutik.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/pawanurekexaf.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/goragasurasubojiredira.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc1f9dbf39---58703127211.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_off0000ae50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC667 10340 bytes
SHA-256: 6821fa3e23a5cd4fafd3bf2cc014488f9713ca25ad5b05d8ce2c3316df1195a1
font_02_sfnt_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 16424 bytes
SHA-256: 42ff0cfbe60f76cb832a96a20ec8284b37a9f864c6857ddc51cf59d68cbee3da