Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13226afcb36d0ac…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 08:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d0e67755b4bb789ab902af21cc5d08c SHA-1: 948574db1045f57a1ecc4f84e133881a9412bb22 SHA-256: c13226afcb36d0ac237e8e275463047f380611ecdf3ce54c089c884d5cc6a7d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stonebuild.bg/f/uploads/files/42566042809.pdf In PDF document text
    • https://grouptm2.com/contents//files/65053232460.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/1937966628.pdfIn PDF document text
    • http://honda-vo.com/upload/file/73955633277.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16081accf4b001---97591999772.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c569ca70ff6---54182419598.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210814_735DD9575876357E.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc9f04eed0---37883241876.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/papivibe.pdfIn PDF document text
    • https://redac.ch/upload/27539256211.pdfIn PDF document text
    • http://premium-t.info/files/files/99028101101.pdfIn PDF document text
    • https://okna-kurska.ru/page_edit/_samples/userfiles/files/71108668519.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/375807871.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/69379348374.pdfIn PDF document text
    • https://bursac.net/userfiles/file/47656875510.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/56064950580.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/moxujevifepedalixukib.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210616_D27BDD3118BA2365.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/kojusam.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/vewudiv.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47684381744.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dffab1283---nisokekezi.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/jepun.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/8506065559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=perception+of+risk+slovic+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 10608 bytes
SHA-256: 63228dcee8c193c7dea7d2270cb99e51c014554ebd6dd364fbccfa893260a7d6
font_01_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 18336 bytes
SHA-256: 74e05417d3c72c6d05adc99504099d0f6ec7efc5c38396b015566091f9ef262b

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