Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95ccc6f8a492663…

MALICIOUS

PDF

73.0 KB Created: 2021-09-14 00:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8109ef84f6f73ed4c1e863ce33d7ba5 SHA-1: 99c8fb019591a61c311b5d5a0c0d40684623051a SHA-256: b95ccc6f8a492663ddac771a0d9cf13b144e3aec3bf3b445676b8fe46d9a0877
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm characteristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=android+studio+back+button+to+previous+activity PDF link annotation
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/pavexifurasava.pdfIn PDF document text
    • http://abnicum.com/files/file/tomifixiwizuriwikisumi.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/zuvebosoduvugotizilelov.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/gipakapukaviwote.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/bugawi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4eb8d5c8---rovovilurapevuderevawo.pdfIn PDF document text
    • https://aromamarketing.md/img/files/71057774290.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d724d222c9---kepidubebebosisuxupap.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/27977607737.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/45699597156.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/64627849712.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/jisegelaja.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161304232181c9---59781919122.pdfIn PDF document text
    • https://robertbah.si/files/file/18149915462.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96975910156.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/xonopulonobobop.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbd960b2a0---85572667816.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/17158754613.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/kixodetuj.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/xekijabosixeni.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/49045005420.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/63495031786.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9f3a7aa44---73807675472.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/67594434644.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/zajoteruvifozot.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_off0000ba17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA17 16508 bytes
SHA-256: 658535766075e15180c41d13869f7ea33cbf359fa29281ebc59fb7fa054c7d39
font_01_sfnt_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 10952 bytes
SHA-256: 49e3e8194fed70cee74ccf1c7d229a5057f4954df0863b4a9d90cd8ff44e30df
font_02_sfnt_off0000fe62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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