Malicious PDF — malware analysis report

Static analysis result for SHA-256 c798ff68b387135f…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 19:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f71ead3a8ebc99e6ad9ea2749f01264d SHA-1: c9b19cb51885b88da61e010b07b7d6b0dfa7ba8a SHA-256: c798ff68b387135f803cba2f229e99980b04c122811af4e42646d0cc0ef31690
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The primary attack pattern involves directing users to external URLs, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://coretry.ru/uplcv?utm_term=how+to+download+songs+from+tubemate PDF link annotation
    • http://theonejsc.com/userfiles/file/vajebufuki.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5c604bbb58420d0182bf725fe74387d3/letixiziwelukubikuluta.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/43529965981.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/55230356782.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/32151754701.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d9da8458---wedawotanugezu.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210916_235304.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613723eec322a---21236571914.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146aa28a027a---xepefosifafilibawuwiso.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021919133746.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/kafisujexuxoziwawa.pdfIn PDF document text
    • http://telecycling.info/files/file/nakolememijaz.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/padijusese.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/38314513054.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/64032685078.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/vivimu.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/zufojixotutazari.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/120806215229.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/xomobenezawejezu.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/36316037058.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/80898027690.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/mugatopolukeruwiza.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5fa63ef83---43717321796.pdfIn PDF document text
    • http://okun.su/upload/file/turunib.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_off0000ae1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1E 14488 bytes
SHA-256: 609dd0b43f48e851c4ecdbd5474bba7dbc70930662400c56a4fec228dee25a66
font_01_sfnt_off0000d20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 10924 bytes
SHA-256: c54ee16c871ea40caf65add109df736830ca012d9581750be622a297c1273011

Open this report in the interactive analyzer, or submit your own file for analysis.