Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdffef36998b98c9…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 07:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e0157626b40e2d95484864e560dd81d6 SHA-1: 5d69a96f30dfef83788eeb2e4c738dfb5009d8e9 SHA-256: fdffef36998b98c933407e112725b24eaa743e5d5c116de1fd75e971345f0816
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to create a link farm, likely for malicious SEO or to redirect users to phishing sites. No scripts were extracted, but the presence of numerous external links suggests the primary attack vector is redirection to malicious content.

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 https://drafthe.ru/uplcv?utm_term=linking+verbs+list+pdf PDF link annotation
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/52783840426.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160758f9a25e0a---61436037796.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/fuwulejofitoko.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082edf6936f4---gozuj.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/55398656860.pdfIn PDF document text
    • http://yilip.net/userData/board/file/vibamififamotogerawak.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/wewegegitoxalixubo.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/30985420049.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/dabutudiwotisibazulaget.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/zaxelexomobenoworom.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/43728151046.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/94116102865.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/1fd768588dd81af5ad85d7bd5d59c278/93817223253.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce1166d352---govapopojilokibetodej.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/ruvigar.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/mapubexikejev.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/343a766f56243efb5cdbc1810fd3c7cb/bepotagisuvemubomibi.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/nasovejusovopipovetivive.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b574bbc1a3---nimewazujuvafidaf.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/75074428541.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/93777391479.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/84817169519.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/kigewere.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/noxumobidaxuge.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_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 18136 bytes
SHA-256: 4d9fffe10a2e2456ed48bc0c329b5c448d6467bbb787b3be41217cb00f9a108b
font_02_sfnt_off00012a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 10644 bytes
SHA-256: 45a74d8cf2075cd602ee52e1d2724e89c5762821d252457b9e2ca006a18f272f

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