Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd174a703ab4891…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 05:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2f1754a4d284a5f25013c64056d0854c SHA-1: 80783492c4a96b79a187bb9f204951a770e46770 SHA-256: 1fd174a703ab48912fcfae043771ba0e7ca3feee1d656a9122c28426790a6f1e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a malicious document. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ghalemdi.com/userfiles/file/pamagaro.pdf In PDF document text
    • http://mosjob.ru/images/file/woseneketavatenedig.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d20931d6eb3---vokodukexisejigu.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/birinumaw.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/zakodofifo.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210605_E8B76DD3A15C2F37.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/5fsmufk3skpgu0ubc7uhtd62s5/folazuwejuf.pdfIn PDF document text
    • http://takeacode.org/user/d41d8cd98f00b204e9800998ecf8427e/file/nijulazipebimopizadem.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/31262277846.pdfIn PDF document text
    • http://bociany.sk/media/file/13945965176.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/vidunimupetab.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102f2b825a35---zufavizapalefusen.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/76211433327.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c79bcb386---gedaxeli.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/rowumofelivimifux.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/23750351545.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/8388124543.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608369fbba32c---92925140991.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/kerazudizawififik.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/84407110269.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ff14aa7683c30f484a4f8449344bf858/mifezu.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/dfac91c40c89e324a5ea61703caceaf8/pubegegeb.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/c8hv60fvf0pquk43mqjmc0e1r0/73778878394.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/19633212958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=olympiad+mathematics+syllabus+pdfPDF 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_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 17128 bytes
SHA-256: 59325427b226b96830a98308930303ee2946884094d01f70898758cfff7917f4
font_02_sfnt_off00012b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6C 10940 bytes
SHA-256: 6dcdbea83c1fa2580b54d90d932ff0b309af38101ab287da09342630248b9023

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