Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e786ef9f3bb47e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-20 17:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d67728832d529d8f0cdfa7fcd61a1dc SHA-1: 76b4d7e1b76425ba83d7b861b324881411b3d548 SHA-256: c6e786ef9f3bb47e94295e3e6dabf511e953dc6301d1aadb3a8e9998285405e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised or disposable hosting, indicative of a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://coretry.ru/uplcv?utm_term=dsp+by+salivahanan PDF link annotation
    • https://apoiotelecom.com/imagens/img_fckeditor/file/begixa.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/83603884810.pdfIn PDF document text
    • http://vswet.ru/f/8156368589.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/peresabuzori.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/83012989297.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/98518248406.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/1279545887.pdfIn PDF document text
    • http://inistor.com/ufiles/files/vedobupezato.pdfIn PDF document text
    • https://upaspor.com/resimler/files/valegitavatiwabuj.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/xavuke.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/vagodobupovuzisusosok.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/sikaka.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdac609b67---zolajexururajoxelav.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/zuluvovot.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16146b801f3a8e---kelavotuzugebezo.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/57918061190.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614369b648114---22112494057.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a4bc9c77---42730689296.pdfIn PDF document text
    • https://forumsevens.com/images/file/relidebid.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/wewanopatujuku.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/71262620089.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/11729195826.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/rajese.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/c682c7887e8988b94f97174b6cae9979/62540274929.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109040305425391.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_off0000c2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D7 10220 bytes
SHA-256: e211616c60be2c3143939f59ea6d7845fff6d760ffafd39ce25d4e058da6b0bd
font_01_sfnt_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 17520 bytes
SHA-256: 3097368f284d9c2d84b025a2917bddd745235fe9df1aaa34f00623d62a59db75
font_02_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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