Malicious PDF — malware analysis report

Static analysis result for SHA-256 136e9b6438390eb3…

MALICIOUS

PDF

92.3 KB Created: 2021-09-08 11:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e90dec8f082475ce42a7ad192df1737c SHA-1: f3418c636d1eeff85c0c12a46f6e88c8ffc74816 SHA-256: 136e9b6438390eb347ce0757a42c7ef7dc4cb344b7e842e8d86d3bc1e9971e7f
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, pointing to attempts to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6adfc4a371---51516168007.pdf In PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613299c8bca65---sobikariguvidelidinejozu.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e6b279cdf---jupiwunozixodijofumagase.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/gosogi.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/vomigivezuvepavisow.pdfIn PDF document text
    • https://scalper.ir/data/files/file/19185165359.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/aa72ae7cfbe98a8ea0169189a22fd24e/77175673067.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/zirepaxirorusanaje.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/65411755004.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c0a23d3d288---bosolusoxadar.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/dotasesebe.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/rizowubarusejimizibi.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/36221629330.pdfIn PDF document text
    • http://abnicum.ru/files/file/kositukegim.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135d27cbd280---kuruzafun.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/otk28nsfrrteb0mfs68ffb3nsq/53886156124.pdfIn PDF document text
    • http://langmypham.com/luutru/files/jezuxun.pdfIn PDF document text
    • http://inercial.es/uploads/files/59375921983.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a181f1b5bd8---reredaxeduwitagatik.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/80350845722.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210808210003.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/litom.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/kefasevamukirodofifizofi.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/felemonakajinanafuvazesiz.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be29e3a7d9f---50445021536.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/72858819910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=importance+of+property+valuation+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://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_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 18256 bytes
SHA-256: e488e4ce65ad59e6bf364c5b2009e3626813c6523cf3ad820d5cb167c36bffc6
font_01_sfnt_off000131f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F9 10844 bytes
SHA-256: 20bb161ea588c34dd74261a6b41d9bbefe34c7d121bf8f7543ad8a2594041e18
font_02_sfnt_off00014afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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