Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f16ca31039c2b9f…

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 22:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd02af0ad8945a4d7d6a632a3ffc630d SHA-1: 2c19988bbeabf4f88074deabe1da89981fae7291 SHA-256: 4f16ca31039c2b9f9015fe1145d0e297aaa9d8fd31373732c227cb8d342c771c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://adec-interiors.net/Uploads/file/87054083628.pdf In PDF document text
    • http://boxshop.mn/userfiles/files/72045208724.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/85631568879.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16155e630060b8---47912851963.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eda9900be0---81155144566.pdfIn PDF document text
    • http://laserinnsbruck.com/static/juwofotuwutatuwokoxani.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/natube.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/7735117435.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613f30adeb60b---78923367473.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158c2d8b735f---birepedowiba.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/56640626096.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/lexabasefatajado.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/xadoper.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/vebaxokikozovapenenimek.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/77901475411.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/44760982454.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139eff1ebcec---silewokozebabanimabipa.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/masadonaxeri.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614368d5c0657---xamamonox.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/7047495852.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/kabirofutefonowabuwimujug.pdfIn PDF document text
    • http://sfssolution.com/userfiles/file/podirozupilabi.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/70374854290.pdfIn PDF document text
    • http://e-photosynthesis.org/userfiles/file/vunomatopadizoximek.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142b9a8a5290---balogolobajegakofodoxow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sons+of+abraham+bible+versePDF 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_off0000b4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFB 15912 bytes
SHA-256: 7ad32b04b5a35c44ddfaa33bfcad883ffd28adbfecd76f6ea1e61215999d34c5
font_02_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 10664 bytes
SHA-256: 5c1297bcd338b1650abc69d21d0d224d32b079b84d897a58e31698002283db76