Malicious PDF — malware analysis report

Static analysis result for SHA-256 c875e2a6aea03302…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 02:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3bd3288fc3474d7c628110f606719deb SHA-1: 50c2b69115b0c54ef5eff4971ee47720c25eb461 SHA-256: c875e2a6aea0330259ed9552ed181f6107518c2a4f6b2fd45d93312b8c6fa5ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://podlahyadvere.sk/editor_uploads/system/files/mofaf.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/53bfa7cf6947b12d511b689cd5a280f3/7976429074.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/39012308771.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/70461788795.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/27708774559.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fdaf2678a78f54fd8dfe4d4bced1179f/11447904586.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/lizil.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/ledisevetago.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/89436929146.pdfIn PDF document text
    • https://protrialse.eu/files/files/pofazolixalomin.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/34601219034.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/domaxuk.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/xekuvasupofuguzizutudega.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/20695468049.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/uddvdpkqic33tc67vb8m7gep4h/2465825250.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/88050968386.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/54041446107.pdfIn PDF document text
    • http://195exim.com/datas/files/daruxunitijetunizuzasu.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/lubupu.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4d09b9dff---sonivalunumamufomovudob.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/pejifukodedikuzolo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a8a0dcfc6---4150676496.pdfIn PDF document text
    • http://naso10.com/userData/board/file/51150896059.pdfIn PDF document text
    • http://polkovnik.su/upload/file/nokebejisom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+pubg+obb+file+compressedPDF link annotation
    • 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_off0000d7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 11192 bytes
SHA-256: e0eb98066995c18fd9a4849b808c099b2feea28214ec6002531e3c122d5b3818
font_02_sfnt_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 16844 bytes
SHA-256: 830c4fb84cca4d192cecbc288070d7b8bcbcc5885d5fdc343706ccca1d54418a