Malicious PDF — malware analysis report

Static analysis result for SHA-256 441315748c103b29…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 15:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b33ff76d5f8465a175dcde60fcedfae2 SHA-1: 0347227fe5b5da82a82af6efca89a76b34083513 SHA-256: 441315748c103b29bafd311cc02c5e234f8072f88c606a71efcd03737e7dfa3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to untrusted destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=fall+io+online PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130d0ba13d75---tefininori.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/29962012691.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210919111009.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/67958069640.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6eef986948082ebdf5d16e855e744006/16515889695.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/37912149902.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614217f7d7ea0---44978622684.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/jodomonifadijaruwovoli.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/50473726077.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146c759b7608---78936671882.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/34907578806.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/4803563410.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/vobizememate.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327b56d0fd1---xafarebegav.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/dozilipunopunoregoku.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/nazixegitega.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/gidawaxowufukox.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/tojutejitaxiwewaro.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/motevuxevodalib.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/88918634072.pdfIn PDF document text
    • https://msiutilities.net/documents/64692130558.pdfIn PDF document text
    • https://partnermind.cz/images/files/tifosan.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/gawelopowedavuwujekofe.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_off0000c048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85E 9712 bytes
SHA-256: e62c08924123389326ff6c5d505976f18c6150a8e166eb079156db5c187e26f6
font_02_sfnt_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 16604 bytes
SHA-256: 320796fde42e6639e920e22563cee9ef20158599858d8c284264d3f20cddcccc