Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e89e01b443c836…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 18:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b5eae7ec4351213f12a4c095688face SHA-1: 016bef12923395b4b08c902e8b50a8b94b5af46d SHA-256: 83e89e01b443c8369114aed429f531117ec47cd17f7f8ba2205edeb41924b201
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 document functions as a link farm, containing numerous URLs that point to external sites, many of which appear to be hosted on compromised CMS platforms or disposable domains. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://garglob.ru/uplcv?utm_term=sims+psychopathology+pdf PDF link annotation
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/kemosusijagiritisowo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ca33ae5f68b167a05414d3df4831f43b/wobabom.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/60818118492.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/fiwarotemepufilizerisod.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/eb0205e670acc2a34286fef7244e8ab7/73629952693.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5effc6886e---56704917574.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1cb594d4f44cf11fda316d7bd92555c9/60071894038.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/bamufawugogakexe.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/jumulanavemirepemejugoxa.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1bca09f6a---91941775987.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf9eb9d14---tisopujenabok.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/rijerame.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a872d9bedeb---49756260281.pdfIn PDF document text
    • http://kasargod.net/uploads/file/23585479608.pdfIn PDF document text
    • http://guchenes.com/d/files/76294981720.pdfIn PDF document text
    • https://efnnma.org/files/file/xabawijamafuxor.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/laxusetovumimulu.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/n6usdpu0svrpqj6v1fe0djkvd8/231823642.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/pasaxedalavefe.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/ad8fdc6e717ffa3546e13b53d4e28b87/95534464358.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/46932809116.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/31183453185.pdfIn PDF document text
    • http://clarasonic.com/upload/file/16064389809.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/50690854585.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161316fca65ffa---finaxu.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/defelutobudutam.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_off0000dce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 10920 bytes
SHA-256: a11a3963669c71c34d8fee614d07ba7bd4ba5ecbe50a07b73b5fa802cdc92575
font_01_sfnt_off0000f5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 17688 bytes
SHA-256: 58c24de4228a53f7d987c1f5fa1ef7b5743e7a6c6c907e534ed337cf233bac5f
font_02_sfnt_off000123a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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