Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab4f47c33d22c1a…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 21:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 735373d55844c28d533f301b1ebeb2c7 SHA-1: b80effb8c477d869026dd4ed418599c2be950705 SHA-256: eab4f47c33d22c1ac130b837d0ad3e6048708c8b522ee85ab0bf932fab11adb8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=convert+to+gpt+without+data+loss PDF link annotation
    • http://szerecsen.hu/editor_up/fininigemukog.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb53ce422---21875109375.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/geruravipevaxariniwile.pdfIn PDF document text
    • http://jucal.es/images/file/72514698387.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/089ce144b5f194e58e641fed830b3c4d/zofex.pdfIn PDF document text
    • http://cga82.com/admin/File/88316674423.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/60924755562.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6817479e0---marorogarepopopiriz.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/89886470281.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/bawapakizek.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613388a9df3d1---gegaxejalabib.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/xuvojek.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/17583166483.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/90489692033.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/9e2eb8c7b8bff2b51f8bd770554c9623/miwibus.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/37639986320.pdfIn PDF document text
    • http://rc-modeller.se/images/file///gadusalevajebumipaxiwibe.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/1258353777.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210927172148_1040019325.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/gamavexofaboromigi.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/dovovadezizo.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/weriwikazuvitagemasavebop.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/todokavegutumaxudibu.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/bokasufamovenutukit.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_off0000b300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB17 10952 bytes
SHA-256: 4fb03d1b9b1881a9143002bbc14a61d542c3cf2b23afe007ff47a3db25c6bb09
font_02_sfnt_off0000e450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE450 15176 bytes
SHA-256: 1396214945a8cec12018d1dc82468ff9c8ef247e13e8315ecc43c82fef483624

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