Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac10e7220002ccc…

MALICIOUS

PDF

130.2 KB Created: 2021-06-22 23:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 03584b8732bdf6f54cc5570dfdf994c1 SHA-1: bca35dedd0dfece9c7030c9e3445d70b1bc0b61a SHA-256: aac10e7220002ccc236b2b8a333a4d7221017e252cb770b55248386eaaed4248
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing a link farm pointing to various compromised websites, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608413fc862ae---mitisirelasev.pdf In PDF document text
    • http://uniquecharacters.com/upload/files/wonekoxadolotiximurokib.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a431be64819---58650458780.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b634e508d3---jadero.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051815473773499.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfbf16b51---7734215387.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/29d090f2765ee74d4985cafd50757998/xikasi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1f656837---rimivebukolizij.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/povibuviluvobofetijuxonox.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vie5f9hh3rmut1pkervqrupaug/zobug.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/loxaponogadevumivumoxalut.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c7347246e0a387144ab97f3c1cfe975b/26596461470.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/51135179561.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/pisubiwawipegudavifiguf.pdfIn PDF document text
    • https://koratspring.com/upload/file/sonew.pdfIn PDF document text
    • https://scriptdd.com/_file/file/71671761651.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=8051+microcontroller+opcode+sheet+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000192aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192AA 10868 bytes
SHA-256: 9cabaf31f4661ebfea270280ee650f2ed1f714f90dc880a8d3b63247f3f2e0f5
font_01_sfnt_off0001b563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B563 5604 bytes
SHA-256: b18d5d45391391c095ee7d18bd3f67e2bd58ccc50471d1cd85cc58d8b1e6d9bc
font_02_sfnt_off0001c861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C861 16452 bytes
SHA-256: f17ef0cfb2257e1589ceba8101dee2038abd4df4ca06bc1374fe0c9861429ab8