Malicious PDF — malware analysis report

Static analysis result for SHA-256 86caae14d0e5095d…

MALICIOUS

PDF

69.7 KB Created: 2021-09-16 09:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4fdfad59fac60a40b98e57dfadec64a SHA-1: 22fd8b6ffa3cc037e12e1ccd59f76d30253d12a3 SHA-256: 86caae14d0e5095daf7d02eb44ff80afa9917b23a934733b4d1d807e17c40266
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of compromised CMS upload links further supports a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://crewmak.ru/uplcv?utm_term=mad+skills+motocross+mod+apk PDF link annotation
    • http://thuexedanang247.com/uploads/image/files/batenemewatifejoki.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/14574096286.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/lidojamaxek.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/32273990674.pdfIn PDF document text
    • http://marymo.ru/uploads/files/nugogulu.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/13787262706.pdfIn PDF document text
    • https://emenu.hu/editor_up/diriwaxire.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/93116027941.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/tiwepenikunufirovorej.pdfIn PDF document text
    • https://renetravel.ro/images/files/niretowapipexogu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132c47bad330---31787888404.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/jolan.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613319ecec515---45622479104.pdfIn PDF document text
    • https://signika.pl/Upload/file/benabeputalurilidatopujon.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/40419125628.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/51706514783.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/lilofipoxatetogo.pdfIn PDF document text
    • http://dytac.hk/userfiles/lusedu.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/jejajozavifupawetej.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/05arbjcdv24p9ton0lqbghcici/lewumoxoguxutojapilixunab.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_off0000b092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB092 16196 bytes
SHA-256: 34e5b31c54bc732ab7d45d735b6cf4b240b70e3de657c6025867fac0dd0232f1
font_01_sfnt_off0000d9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C4 10524 bytes
SHA-256: a2e28622b0f23989cd87cedf1304e43491a8b5fd6c6f19fd92e71dbce235c55c
font_02_sfnt_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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