Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f074092592f1d6…

MALICIOUS

PDF

117.9 KB Created: 2021-06-27 07:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03e678277385595d4b2248c56f273218 SHA-1: 07a52642f1af882fd8d44ca3dc2519419db289d5 SHA-256: b5f074092592f1d6d3df4920b13dd9810b7daccf1294ec76ff4e76edf3852ddb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and other disposable hosting domains. The presence of external URIs and link farm characteristics suggests the primary goal is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 https://smidgel.ru/uplcv?utm_term=prehnite+crystal+meaning
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3b329be1de9a04a2a9ee38f53525af88/tobajuloj.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/55f2a742f3d59d18b5d72b294fb6b50f/86183679607.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ba18ni6o7u5au21thncubopors/47179390770.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/li7itpcekbd5k7sm3an86hu80r/93721751199.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2cda386d4404dd77f030bc1f1d936b48/56743627494.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5dee0d400---63959359515.pdf
    • https://hogies.com/includes/template/uploads/file/fususemujeluvelikefifa.pdf
    • https://seedomoretravel.com/files/files/37915946270.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9614cc9fc2---jirirudojaxo.pdf
    • http://zlato-invest.cz/upload/files/budesabidoxaga.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/3a47888691e52bdb7ff6338372049021/bojutifol.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8cffaa17e---37318307692.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/tisitevurinexenupukawapim.pdf
    • http://broadmoor79.com/clients/864886/File/kadinupavuvux.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/v946mmdv35ojt0gm1oqr32uo4a/99882065475.pdf
    • https://thinkhigh-tech.com/d/files/metujesolesof.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e7eed50e38cc16c226144e8814dabd1a/suwafel.pdf
    • https://33mobility.net/uploads/files/balof.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/fa37cf90900bfbb69918e17e3bbbfea8/kubukulukide.pdf
    • http://zhengfutz.com/v15/Upload/file/2021520447545782.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a581df76467---76425569903.pdf
    • https://hophamthaibinh.com/upload/files/tetaxatirewax.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/12433776169.pdf
    • https://atl-50.com/files/file/90023638295.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000168ea.bin
4f4bb3ec05bbd1e95334fee54dce6e6edb6cc300e26e7a5c8c2c46d8493e0763
pdf-font-stream PDF embedded font (sfnt) at offset 0x168EA 10672 bytes
font_01_sfnt_off00018130.bin
4a14ddc94cb93978e5c7451ca9dd5a84a9ca8cd4f4dd51be36069499c4217453
pdf-font-stream PDF embedded font (sfnt) at offset 0x18130 18620 bytes
font_02_sfnt_off0001b243.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B243 16792 bytes