Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de0735855d7cc5b…

MALICIOUS

PDF

95.3 KB Created: 2021-07-14 06:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 55c48037d2eddb29b51a80552afc0cde SHA-1: 07317c8655903e2c887f90d8003464fa77ec8698 SHA-256: 4de0735855d7cc5bf60f3c0e115a4c8be3a8dfceecd5c00a51bb918d9137c323
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. No scripts were extracted, but the presence of numerous URLs on compromised infrastructure strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e839826cd---30249541283.pdf In PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a0ae4bd0d---58057936196.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/d2bc478b538e1fdca9f5d9c25a4cd4fe/17791509641.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3003cd424b---bizivutexujevagosopori.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/9393470210.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/g08jf3g74ok2i3hohck7un2kb1/91532821171.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7d3079d539345b622fbc760d2c9ef7d7/518610352.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/pewegoxumipipuwepase.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/84985293390.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adafe2d483---60632052174.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/wowirosoxefebono.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/dapumadorepevilasuwe.pdfIn PDF document text
    • https://mfdesign.hu/files/file/41509006920.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/baniwasederofojolew.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc1356588---25223783510.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/983e6933c8cb6083a15b6f6877835e29/93849254759.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/44605365777.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6c8d5758f---78318584066.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/50896448566.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/27259068341.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088de99c1ef5---3154363353.pdfIn PDF document text
    • http://bptramptour.pl/files/file/85295742016.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa16e252848f1c485c6b513dddf75262/20183001612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=infringement+of+privacyPDF 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_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 17104 bytes
SHA-256: 9d9b8f7ba791c7a6d03265f1d9f54d87d7a662330435e0e97c48ec9b2ac37174
font_01_sfnt_off00013f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F57 10740 bytes
SHA-256: c7ed0dcf305e2bd784b9db551e5dfad0391b8d950c150f640c56d0d6ea87f6ac
font_02_sfnt_off00015811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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