Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff3a638468ffbd2…

MALICIOUS

PDF

83.9 KB Created: 2021-08-20 05:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 479cffe7006904b812ada9d61028dc5c SHA-1: 0f64179725984a7fcb8e1de8f3049d026c8ff48f SHA-256: 4ff3a638468ffbd205b368db0518dcab843c1cb9e28ddbdcda323506d90549ae
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://thetestmag.com/userfiles/files/samokejirejupomugeberoban.pdf In PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/wakukifusuzumoled.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67551c3eee---nimafafojoro.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/33657996546.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/denujolotabapinodaluwiwas.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/5d45e65f103ebc03311a088674ec3e5f/56743126914.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/4092503009.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/mivogemaforobu.pdfIn PDF document text
    • https://viettrungson.com/media//Files/1519829822.pdfIn PDF document text
    • https://jotelek.hu/files/file/zobiwibavimilola.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607215bbb2c0b---fejojama.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609515c6ab74c---18303527827.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/92378429323.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca84ac59a1d15081e2b8f3d8c7819d51/66831023192.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/42249697675.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/b5c41a685e0d4561a32c2f22aee818bf/22900139844.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/47229230746.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/18975286618.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608321b3d2567---31634184885.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607661b852150---bagaj.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/furawowuzunesade.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/18231028544.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/penugotanekusutozula.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b810bfc2471---68387421871.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/zofutodivowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=borderline+ki%C5%9Filik+bozuklu%C4%9Fu+olan+birini+sevmek+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_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 18640 bytes
SHA-256: 5a80a909f03ce9060c13ad62df37069a4a0cc9850fd8538f7b93ff9f758639d0
font_01_sfnt_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 11548 bytes
SHA-256: 921e85ce17563a39c51fe04646e286f1f3ac8f69ebaa5585e2e4d5445b505c1b

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