Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4be3286e2826b20…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 21:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ebaa7c87157251c6d3d5e361abedb13 SHA-1: cb8e122ef32715a75e1be9cbb661ed5baab446c1 SHA-256: c4be3286e2826b20b696e7b75167ac1b0e241ae80d468d2e68fdcf3afed3e803
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs point to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to malicious content. The file's structure and URL patterns suggest it is part of a phishing campaign or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=stream+ice+age+dawn+of+the+dinosaurs PDF link annotation
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144df9f967cf---pozorilokevuxamoroga.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/newigefiwinirage.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/balobup.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/68225698980.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613391b921d90---55171686919.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/zemegotenijidadegoboxu.pdfIn PDF document text
    • http://hodori247.com/uploads/files/sodazoga.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/letikeredegazatanebo.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/26244529558.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/xirukokujepewoket.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/lurixawipemo.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452e7443e92---funoxobewedosam.pdfIn PDF document text
    • http://edeins.com/userfiles/file/36928427530.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/17568592948.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/82272247113.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/wiwerojifalipuferiliro.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/6457f3lnu03a1arvi6fpa0bj61/xezelisuxixaxedo.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/xirujimu.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021091805112629776.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d494f5f601---lipevoseriw.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/fewukuzawejofaken.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/27222509565.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2ea5614f1---20833910176.pdfIn PDF document text
    • https://limsurempat.com/contents/files/tisifaxaxobepamoto.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/952a7d3527fd17866cde8ed0835a5235/91295938553.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_off0000bc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6C 16944 bytes
SHA-256: 8b0f6863e00e9debe7593da24bb5efe8a1f403fafe879f89c18a9dd80ba82b8f
font_01_sfnt_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 11136 bytes
SHA-256: 7c2377ca85c9288fc585a47b30bc5ae242833f60a4f6c9e60be13c4920c280b0
font_02_sfnt_off00010188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1