Malicious PDF — malware analysis report

Static analysis result for SHA-256 b137f9579f455ba9…

MALICIOUS

PDF

88.5 KB Created: 2021-08-01 01:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2b2bfd34915d18c00e3b2990f4c0d7c SHA-1: 41f3543805dba8ef18828b9c18411f1ea0e0bbf4 SHA-256: b137f9579f455ba94b138541244496c7a9b1f3b52cd86e19a18f690b7d7ecd48
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://hram-uspeniya.ru/ckfinder/userfiles/files/96711571362.pdf In PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/997a9ba089219a2b20694b30964aae3b/pajodarusiborojogup.pdfIn PDF document text
    • http://handgun.ee/media/file/22076685525.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/1994621112.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/20951865118.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p62g0a4st4jbivcfq992tu2gp2/wesewesiwalenudoguxepun.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021073007350397.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/pelijinupowuwusutubifeweg.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a18e54c636ef8077496876ee9690b1fc/gofasogetugelim.pdfIn PDF document text
    • http://mayjack.com/upload/files/72994093829.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/46763254014.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160908e36d78d4---demetafafakubu.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/49323814414.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e31a233dc---vawipiforurofiwakilomefi.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/buratifuzasew.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/3142804350.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851a93dd9ad---77135130995.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/73566792881.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/9748d13fe981031ebac7d63a4f6f4fe6/saxorinagibafoxe.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/bc08fd297f4b672ff704d2e8d6079249/52425934887.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/fab81e493c63ed5891cfee997e8d836a/jevavupesojup.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/91133510377.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2cfa56ba---xigewevuxudifuxuzode.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160912fab0188b---14280944364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+prepare+for+an+hr+administrator+interviewPDF 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_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 10860 bytes
SHA-256: a54562ceca0034d1e782f14a33615b31b726a26faf5db67710303a9f2c2019a4
font_01_sfnt_off00011166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 16284 bytes
SHA-256: cf456ff9c65a2b2f13e66f50527f1634e18f677240dc0069005605a09632da10

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