Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02ca9a3d1aca0c7…

MALICIOUS

PDF

84.5 KB Created: 2021-08-16 08:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ee4c922f5ffba6821889304fe3a8dd3a SHA-1: 50f7a97b291b1e7ddf0b91b03f8e920b33e264a8 SHA-256: c02ca9a3d1aca0c788ec02de1e863c72c19e6139e125002dde1a81937574a010
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous links on compromised WordPress sites that redirect to other PDF files. These secondary PDFs are likely designed to phish for credentials or deliver further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=best+pizza+dough+recipe+in+urdu PDF link annotation
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c741ae60adb---50657248047.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c2a0c38bdcb3cfe3c535e4a03e157d5e/gowogas.pdfIn PDF document text
    • http://aimic.com/userfiles/file/93776637536.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/46913494531.pdfIn PDF document text
    • http://livestocktool.com/d/files/busamozaxepeteloputaxala.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/76032419307.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/46305801106.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e6ff99f20---wovapeguvajopumemisepajo.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/nogovasikixesefa.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/69585905231.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb94c31926---94662473432.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/nunudatidepakoguparip.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609449064fdfe---14241148345.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/39145588391.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/80157027615.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/30388213757.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/pibuvolibureronamuno.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/tapulavafanosawumibanafu.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd94b595fc2---zosujakobinapi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16097e21cede60---18363055409.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/fenidikikegu.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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 17232 bytes
SHA-256: c154ef80ce118fe2af81c4728370268e978197b309f10e5ef0cf6948626fa233
font_02_sfnt_off00012993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12993 10960 bytes
SHA-256: 294c828c82c36e81ec6390b70461cf0a77d456ee4a149102a8f5fb8c27f14f20