Malicious PDF — malware analysis report

Static analysis result for SHA-256 82019973b1bc8706…

MALICIOUS

PDF

70.3 KB Created: 2021-10-03 17:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a4392d634d2ae0048fb4afff472c6971 SHA-1: aabc7a618b65f3deb7fb712366b4cb59e70b509b SHA-256: 82019973b1bc8706d7d810e6b46dfdaca87a574fb5f872aaf8a6e65312874425
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics and URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://argumentua.com/i/file/33177917249.pdf In PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16156919770ef4---gujenofowufekotevudorogu.pdfIn PDF document text
    • https://ratodua.com/contents/files/28082273137.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/84i4d9lh1sb0imdi05a0rr6969/79185006095.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/45226136626.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/purabisuvidejube.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/gitixa.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16149a6516da34---fokoxapigoso.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/wedosojezedul.pdfIn PDF document text
    • http://sd-bada.yupucx.com/upFile/file///ITX202109302212394873.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/91249882686.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161564df50d970---fabixutofimu.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/rugetenutilefurebulev.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/vodunosinegokujotevos.pdfIn PDF document text
    • http://scarpatti.com/files/81959951822.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/motududofeporazoripe.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/54722167018.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613719b9d5474---77053247960.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/64456491887.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d320b6875b---kivomobizusakulibuza.pdfIn PDF document text
    • http://liyangah.com/Upload/file/95824343320.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/gulakijaxa.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/26311567196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+a+ratio+scale+in+geographyPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/10476646601.pdfIn PDF document text
    • 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_off0000b0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DF 16436 bytes
SHA-256: 167c21e836152fb42f9e5b60da3ab0ef38c0afc82757038156f1207da6eb5552
font_01_sfnt_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 10760 bytes
SHA-256: 67f1598a8ddcb934c8ea68d1a0317545ad206a1e3dfc93c63f69ca5892b307e4

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