Malicious PDF — malware analysis report

Static analysis result for SHA-256 7113b9dee7bbcd73…

MALICIOUS

PDF

73.5 KB Created: 2021-08-31 13:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1c2f32b44cdf4d2bbce9c8aef38f2c1c SHA-1: 1b9db33197ad21a969170049f441b15cf4c9ced3 SHA-256: 7113b9dee7bbcd7371a6ac21cb0c37def091bd2af3d1e8145ea7b143e0f823a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Numerous heuristics indicate it functions as a link farm, pointing to compromised CMS uploads and disposable hosting. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://msinziniering.com/userfiles/file/lidamapagosej.pdf In PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/22842fe809a3015982c9e0f86e2eaaf0/nofolu.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/gupefeguwefuf.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/f6bhm34rv2ubjr1hrb5vbr9591/77826643691.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/33061970811.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jevonokiv.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/94695858616.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/debinoso.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/zibipisez.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/11309437185.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ff1be8a261a8cc23c497d56ad3a37962/guzujotisepono.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/loxeriwuxesowemuletesa.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab27e1df9f9---wisalemefupakitizuj.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/38343940128.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/rufutejuwudavosora.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc44c1be299---kegepufojow.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///tekel.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160beea45a7e74---luwifenutanopovaduwatiwo.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/9934578930.pdfIn PDF document text
    • https://whitesal.com/data/images/file/7464_20210517211308.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/rezekuferetonomovedu.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f90e2cc62932fd075ce26c01c26ac9f2/11405828815.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/xepexitufowow.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b545deca0e7---25851261644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=shipper+in+tagalogPDF link annotation
    • 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_off0000bc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC07 10440 bytes
SHA-256: 987d05a49a6bc9296b4dd0c67512deaa4331c848b94ddfb63c848365d47adb61
font_01_sfnt_off0000d3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 16888 bytes
SHA-256: ef08954f21313ecfdf79ebb4ed18cafa1ff2177539bea3d5d91a8340b06af24e