Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e0abde7bcb8d7a…

MALICIOUS

PDF

77.0 KB Created: 2021-09-20 15:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 567a7950cb516e6f7b4151aa0b056037 SHA-1: 8ef742a749722d263dec43a20eb4c9fbf369763d SHA-256: 72e0abde7bcb8d7a5961e5407c0df0ab31ed5289b16ff412a0ba7e333e36a9ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload directories. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL destinations suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://magnanerie-cazilhac.com/userfiles/file/nozugekazitevigesiga.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6693e8261---konodin.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/zaponunazobafoja.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/7972951060.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/79795004983.pdfIn PDF document text
    • https://www.znackakvality.info/files/90222263104.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/zituzalilenozuja.pdfIn PDF document text
    • https://ksboutlet.com/file/files/38243922028.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/88575978558.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/rivaxedolaxinoxebofowi.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/firenexagebapewez.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b68bd4e8a---89857436476.pdfIn PDF document text
    • http://levotst.com/uploads/files/93687303446.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/56699153444.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/wopujefunidiwir.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/11822800526.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/bobetalerapevudikoxa.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/kedejorunirokemovino.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7dc4a98e6b8be775d17f93f1e5b72ce5/7861493364.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/79742972405.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/34140038142.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/06cf97e5078fcf3e0c5d5f8c2a9b0917/tupexesapimotana.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/rofubufaso.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/lidanefebezikita.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-06/images/files/fekebinimibekov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=play+paper+minecraft+free+onlinePDF 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_off0000c7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 10588 bytes
SHA-256: b5291a91c3171a689c43e310e3fcdae2e6df9d5500f56a997f8d7f98401ede25
font_02_sfnt_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 17168 bytes
SHA-256: 6613232c85da0a3156c83f2b0c966a959e0ffa98dcfb89539a195caf528d44d4

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