Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67337ecba231b59…

MALICIOUS

PDF

100.7 KB Created: 2021-07-20 01:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b0906dbdb7833ea2453a005b973ccfd4 SHA-1: c5e1718e91c742f03c3397fb7b0981d709c6583f SHA-256: d67337ecba231b59158815904f7559b2a0acc3fe6551515f0cc4072f311f435c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The PDF structure and embedded links suggest an attempt to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/91b66f00e74c230da8771df82e6cf0f2/84548112912.pdf In PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/i0eat7mk641shqdjh3ugsdkb6d/35493509949.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ujjtbmpppjkn4t6o52patqgpak/zuxetekopirofeni.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/5872207368.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/tebufozapitumuloloro.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/67845825812.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/31290182995.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f998a4542da8ea9bc347665ee930b78/20394432409.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/8d0b942dru3ar3a1kijf9t41i1/lidipuwonamevunos.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/46069499693.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e079618dc93e7d27ed48787331e4f0a5/70292101775.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a344d57be78---84783175410.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/69795217251.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/n173t24vqmmgs9cqt26sav5h8g/43952329211.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f5eaf4b3965---17498896576.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5ce6d125b---76141553229.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/65425323315.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/322b37031ff2ae2f8f25c1f1e2225a79/25558019968.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cf115eaf2---dowotis.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4483bdc546b366f3da294bd2416a0201/zolorifazelijozazekob.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c462afd6772---14379800583.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/dc26cb77b9722ca66ee2465d135ee795/jezunonimuxegivazesujefab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=foul+mood+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 10300 bytes
SHA-256: c6bf6d26fedc8551cbba91142644e8bbc344ac4b29dd78aa5ffbf96d090207bc
font_01_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F8 17480 bytes
SHA-256: 2a76abdc2945e09877f9529bca0eb129685e7d45c9f6803ab4614fc4412be118
font_03_sfnt_off00014f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8B 18040 bytes
SHA-256: 356f1153f2c095480757686990ab0bfbe24e098c8941a431235aead3802f6be8

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