Malicious PDF — malware analysis report

Static analysis result for SHA-256 205fe1b1e44564e4…

MALICIOUS

PDF

78.5 KB Created: 2021-06-13 00:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 119e4b7c83256d4823d0a8665cbcd0b7 SHA-1: acebe5aabef27f609792db9936fe2b73d8e1bd23 SHA-256: 205fe1b1e44564e4de6d3b5d8d8aacc5eb0c8576d79de08924ba046b4baaed05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=top+comment+bot+instagram+free
    • http://belst.by/upload/file/serikumolokudewevagivop.pdf
    • http://medi-sen.com/files/files/20915828143.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c41e94a8ae---5407362039.pdf
    • http://pphu-joanna.pl/fckpliki/file/jabepipuneburapuxajow.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607373e1b59a8---lotojopi.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/69950f544d7dbea8306122031fab795e/labukivevurixe.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c690e4190---ganem.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa0f7f051b---pagotemuwuke.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/19ae6cac851bf657a44d2172b56c5086/tuxal.pdf
    • http://strandedtattoo.net/file/15459784557.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16095760b0d1bb---27152780763.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/a1d9895f7b528f9599ac5fd46b21421d/63421422280.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8bbe3afebda5102e341cee125d6f4600/7597531029.pdf
    • https://its-bulgaria.bg/files/file/16144889285.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3227e2e7e---86513831738.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608794b3dda36---26696414766.pdf
    • https://rimsball.com/ckfinder/userfiles/files/72884852593.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e859.bin
b141a1e2fc5e6220a476d5033994bdcfdfd679126b324073d927689e80ad50c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 5180 bytes
font_01_sfnt_off0000f9cd.bin
12468bbdd78a3a28c038d22dd78d1ae0caf39219338879698c97ad32e13b03d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 10892 bytes
font_02_sfnt_off00011ecb.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 4324 bytes

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