Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc7056c1adc9d2e…

MALICIOUS

PDF

91.0 KB Created: 2021-08-07 08:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ee1f9f410d58c6f92437102df0c961d SHA-1: 56a1663d7e67ac4791593090012774d8bf14b500 SHA-256: acc7056c1adc9d2e3ee516846530d933b5d9fedd77712285e905b7b38c30c6f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.injamal.es/nueva/ckfinder/userfiles/files/zurowiginowipivaw.pdf In PDF document text
    • https://btcauction.vn/hinhanh/file/84540914318.pdfIn PDF document text
    • https://wita.lt/images/files/38589118570.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/65391846246.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/85878566589.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/6ce3fd1849a453b9d0920d705da2de3e/68374521098.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b5493e953b4---simafiwedidikudosupixotim.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb89670017a---pidizasepamisomofupupox.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/sabinudegin.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff59f136569---tevalowexezimaxa.pdfIn PDF document text
    • http://df-foundry.net/d/files/82194619976.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/aea26958389666bda31d00d60b1013c3/55862255654.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/54540310490.pdfIn PDF document text
    • http://rideco.hu/upload/file/29817200642.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/93164129892.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160729528b1823---zusazexobawenos.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee5289fa23---26826972823.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/90083662834.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/61601704593.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/fanunexavagogozibofawojis.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/62446842854.pdfIn PDF document text
    • https://grnca.org/img/files/files/gabokatewawigazisefi.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/98959185470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+print+multiple+pdfs+on+one+page+macPDF 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_off0000f8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 19652 bytes
SHA-256: 330978256e7fc1b9da8f2032e6b9e37665e3d1cd4dc9278e7c61684f423cfba4
font_02_sfnt_off00014361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14361 11140 bytes
SHA-256: 6316d018f5659eba76bcdbd151ed6c227800bf31b96f9675811a0dfc9fae4469