Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73ed38e3c404a6f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 09:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f69c93a014e8b857386621b0bf357147 SHA-1: f0c4df5dcd270de0a9e222a3abba47f4caab36a2 SHA-256: f73ed38e3c404a6f887f5b3e27351ef6c2678f89bb8eea397527b3f8cc7001b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=awd+manual+cars+2019 PDF link annotation
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ca7f9f659---85667029392.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qe1nloe2ca62kqjc3vnivfm0k1/89700225010.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/nibipanujuxarumexirat.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/tojifemozudubo.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/88099377993.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/sqo9b4hvigm9bpv5rvnd492lqn/vofadalunuponikerodomidu.pdfIn PDF document text
    • https://dm288.rs/slicice/file/59153209901.pdfIn PDF document text
    • https://adikketiga.com/contents//files/83409593711.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/paruzid.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1e8c2f0727720fe477a2b6a96153c196/11768313386.pdfIn PDF document text
    • http://flexa.cz/docs/file/82718282338.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/61437719125.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/vunatinenupadevizakuvanu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160819408e5c53---84553014261.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e6978e18d---97495307861.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c5e5cbc091---45089866579.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/kigagafotawi.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/53001813845.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/67358216109.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/29862372857.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/pojenosiwafevubadegom.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_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 16720 bytes
SHA-256: ab077d1454338ff15043169f595c57cbeb64ba2828af33d41b313781bf123336
font_01_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001249c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249C 10716 bytes
SHA-256: 4a078ad189749b11a94290004857f49d7f7d41f1655bf55bb96e1c6536898669