Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec1d5d2a9638331…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 13:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6b41d45cafa96ad12302711fcf1905a SHA-1: 8d5e23829807c42e0a9a97132a03a84be9b5ef12 SHA-256: 3ec1d5d2a9638331afb3d8c8ecd19c99ac01f6be4d34636a6a3241af1ead2a3d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5b5a0cf5ad6cdfd02983546e5c6cc7c5/tajuvepewubapumilijejixim.pdf In PDF document text
    • http://foxgraphics.paulsfashion.in/files/61690317730.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/jopotibuze.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/lizoxowu.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b0a8126e1---88227887027.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/ladulexarotipatefane.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/56444007758.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/xudozumumuro.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/68862606242.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/77748990213.pdfIn PDF document text
    • http://cycling-software.com/files/file/1102529509.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/lopixezojakiduxam.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b7f722be4a630a526f64f0307b43de08/fuzokinisebabumofot.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/dawubigetixavavilivatuj.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/62069182846.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/zisaja.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/67578275203.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/36708783255.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7220ee71099874ba176d6774cd45b16a/30025299416.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/69394547243.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/73097337169.pdfIn PDF document text
    • https://pcetravel.com/files/file/41118983406.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/20409142143.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/93258781302.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/79368472495.pdfIn PDF document text
    • http://www.heksan.com.pl/file/53209774528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=o+se+5+wordPDF 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_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 17776 bytes
SHA-256: 9d97af7193561236fb1905921e7167e182a4c1c09540e27e52600fdb75a58289
font_01_sfnt_off0001190d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13123 9984 bytes
SHA-256: 9cd2f2375a195d1dcd0b47f622c676bdbfbb55ef6dc55c0bf201edb4ac41b6ee

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