Malicious PDF — malware analysis report

Static analysis result for SHA-256 9955f549939767a7…

MALICIOUS

PDF

92.9 KB Created: 2021-06-27 03:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 332cbce53a9e7781ce411a02be26fc53 SHA-1: bf4e6e2db134d9bf57e792a12fadc70e661a1035 SHA-256: 9955f549939767a76db8587c9a171069aaba0f5c284161008da0acce6626bc3e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. One URL, 'https://garglob.ru/uplcv?utm_term=wifi+sniffer+linux', indicates a potential lure for technical information, possibly to disguise a phishing or malware distribution attempt. No scripts were extracted, but the extensive use of external links points towards a delivery mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=wifi+sniffer+linux
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160925ea948775---76877034786.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082596c1da8c---28067472143.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34c65e22d---96564237907.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/nun2lhvoksfj7mmk5t5q32svio/94269711508.pdf
    • http://oreade-breche.fr/userfiles/file/mexaguxojuxubogosot.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893fbc94f07---lonuxekakepuxuni.pdf
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/mavakowodal.pdf
    • http://pechati-piter.ru/userfiles/file/43406292308.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/4dc4f64e1bea29fe79917d862fc91ae3/60138629622.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a91b7f9e474---fuvogovisu.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608617179946b---bumerinatumik.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/bn3f4hvkprdvdsmec4akdmo0rk/pipuga.pdf
    • https://istanajp2.com/contents//files/sumizabovefid.pdf
    • http://nesthomes.in/userfiles/file/rakado.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858cce66957---83636487928.pdf
    • http://hasici-pristroje-eshop.cz/files/file/siferumodamigosas.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14e9e6ff22---wejudaruzeniwotenikezato.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c8867ad9c53---20354261680.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/jekavudelibarufaxerad.pdf
    • http://quatanggiabao.com/images/uploads/files/kakoxosavofazamulesu.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f6a591d99---lekobagivedu.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/neieefvj16vu223n6np4kbj8pu/40277690821.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f365ff2bac62a8ed5d036c5413bfcbe4/21910523189.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_off00010897.bin
1e189ddca78ae051feee4fa038550b25b1a94b4d6fc78254065140cdf287490a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 17912 bytes
font_01_sfnt_off00013828.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13828 16792 bytes
font_02_sfnt_off0001503f.bin
6aa413e03f13d8b758c86fa36ad62120ab2266f51920a70f761b1007ab0d4403
pdf-font-stream PDF embedded font (sfnt) at offset 0x1503F 10024 bytes