Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e25839175254e8b…

MALICIOUS

PDF

83.2 KB Created: 2021-08-26 09:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce8c2c4a82bca54dd626def56a5528bf SHA-1: b48e4e5574ecf76ccc858cb52d59b2eb2749afa2 SHA-256: 5e25839175254e8bf0a17de4ebe725ae6c12f4d6cefd132ad814f5b91e8d2623
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, further supporting its role as a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/cff2c2852755e7dda3588b51abe53273/27112837835.pdf In PDF document text
    • http://miyozenemeryville.com/uploads/files/29316838198.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/laveroxazurisos.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021082403564850.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/nekofu.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/4f8ccddff5d4ca8d54d8a8021dc535bb/59602702379.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd4e8ee3c36---33617067821.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/15101969371.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/90473275949.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f81be1e42b3---4982459675.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/lepuvesabal.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/61868683b2085a1560acc19c4204f92f/bibidudonelametupawo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f762020d3c---kijod.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/6f7mk71e6r9adi9bb7ggjkj2jv/xufapobuwanofuro.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/14901368927.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b6643e6a477---27362393850.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210715164232.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/31095663949.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c410a2d83---befujakolusakixelowokeros.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3914093167---juvupopolezupeturewite.pdfIn PDF document text
    • http://turatabor.hu/media/xisarupolowukunepus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=steak+marinade+recipe+with+soy+saucePDF 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_off0000deb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 17252 bytes
SHA-256: 7b2fb0d42882ec99aa47339beacdf5d86fc3045d9b0b08a83aec69e48f68b7e3
font_02_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 11200 bytes
SHA-256: 64b4122dd724ed28e25e23d9c285df10f8596d1d74e0ce14e1925fb0db5b3829

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