Malicious PDF — malware analysis report

Static analysis result for SHA-256 62963df965eebb4a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-15 15:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aeca74b7dc83d2d0754648cf14f6974a SHA-1: e7bc387cfa531a1c216f0f28ca2a7e9d9d824a7d SHA-256: 62963df965eebb4a1066387a9942add17b2b7dd827e697888e35156d04016c3d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of numerous links and the nature of the hosting suggest an attempt to obscure the true destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/45356489080.pdf
    • http://coimbrasoftware.hu/images/uploads/files/batatiwotesug.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jc3vm9nscb7aqj6ol8bsdds4h9/mepiwevosikorugibezu.pdf
    • https://hk-delight.com/UploadFiles/file/razawoxosuj.pdf
    • http://bargiel.com.pl/ckfinder/userfiles/files/67035459243.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/tobugimexavatekutopakodu.pdf
    • https://apsco.ly/userfiles/files/61078912386.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/206f7874028a428a7fb7cf7594610f0d/74172159193.pdf
    • http://nexxosrealty.com/userfiles/files/mopofajexudeke.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/25600058975.pdf
    • https://gelblighting.com/userfiles/files/pafetaxamul.pdf
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/posaxulitopagetijusefete.pdf
    • http://sitarofindiamd.com/userfiles/file/39335098952.pdf
    • http://olympicthesportshop.in/uploads/kiwanorotexulena.pdf
    • https://congnghiepxd204.vn/upload/files/pulilomapumawigujulaxaso.pdf
    • https://biholka.cz/uploades/userfiles/file/12287664604.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386e5dc0537---vawipoxeminaduloxofobu.pdf
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/93265816038.pdf
    • https://mwasafat.com/uploads/files/xovesobulu.pdf
    • https://radekslodkiewicz.pl/files/file/9785258791.pdf
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/rudeg.pdf
    • https://argumentua.com/i/file/buripanomugidi.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-9-13/20210913095851652753.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=gta+5+money+cheat+phone
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A6 16792 bytes
font_01_sfnt_off0000d1bd.bin
1eaaccbf265a40ee6f0b2f62789295cbd389cabcbc74b7b028d35ee3dcdd2245
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 10520 bytes
font_02_sfnt_off0000e99a.bin
16d8d5d437d8d79000f39a6df981802652579d097ab1fea0f9478d196d3f3101
pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 16452 bytes