Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8fc6bc2129a612…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 09:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45bdeea52c0b17a2a9a055e9de6e3d90 SHA-1: 5400184393802356b7462747fa8727b07623963e SHA-256: 6f8fc6bc2129a6128c446ca7f9d89adc9db06247087f059609e56c4f9d4f4957
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 external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

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://smidgel.ru/uplcv?utm_term=how+do+i+delete+files+from+my+android
    • http://baove24h.org/upload/files/banojubiwugezarexogojeden.pdf
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/1908468018.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a62c5545c52b2b4b3df9f77a2988449/dubisusenatagolowuv.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/zixanukanakan.pdf
    • https://dacola.com/upload/files/65269192175.pdf
    • http://capesociety.ca/uploads/files/62343492616.pdf
    • http://jinyudachem.com/upload/files/74712967992.pdf
    • http://orthocarecentroortopedico.it/userfiles/files/jexojodosif.pdf
    • https://recrut.com/files/files/55664145006.pdf
    • https://netkat.in/ckfinder/userfiles/files/92231338785.pdf
    • http://creative-format.com/upload/editor/files/sobunifiti.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427f594ca4b---15979891971.pdf
    • http://suphammamnon.org/uploads/files/84528945235.pdf
    • http://zaun-produzent.de/userfiles/file/damaju.pdf
    • https://khonggiansachhanoi.vn/uploads/files/21973274209.pdf
    • http://ritadas.in/userfiles/file/lifanawuvuzimatedexivu.pdf
    • http://nscenter.cn/upload/files/zolajewemoxikeg.pdf
    • https://pkmoscow.ru/ckfinder/userfiles/files/63295009584.pdf
    • https://kanat.com/upload/ckfinder/files/57380631591.pdf
    • http://enewind.com/pliki/file/sixonulitubiva.pdf
    • http://7sate.com/filespath/files/20210907203656.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161312360967a4---berivadeka.pdf
    • 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_off0000d52d.bin
c13eb78772e6691181f080137a57584fbbf17f4585eef372bfb7cb497cb11a07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 10704 bytes
font_01_sfnt_off0000edbd.bin
41163da57635b477d04b9d90f656445e3728a1ffa425e622f7c5e3368a7b6ad1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 18156 bytes
font_02_sfnt_off00011d17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D17 16792 bytes

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