Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27371da5e5aa424…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 08:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e337715ceff790eedf0fadee47302743 SHA-1: 42fa1f2de268d2cdbeee819e986f9a015c7530d6 SHA-256: f27371da5e5aa4241d6bcd4e7a1900206a2a13d50c4f81ab950d06a1401d6e35
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely for SEO manipulation or to host further malicious content. The presence of multiple external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/9429thtt54im5cq3e0lmh1c8fg/dovajed.pdf
    • https://askisan.com/upload/ckfinder/files/xavobagopobubera.pdf
    • http://finalbrand.cz/upload/file/viranero.pdf
    • http://thienminhgroup.com/uploads/userfiles/file/33380714404.pdf
    • http://studioesflores.pl/obrazy/file/36550217029.pdf
    • https://areopag.ru/sites/default/files/uploads/43008902578.pdf
    • https://ideylia.fr/uploads/file/tuwavumulilijom.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/fawigajimedujilepi.pdf
    • http://yogaschoolofkerala.com/photos/editor/files/4658806670.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb5184b97---3352657991.pdf
    • https://cncostruzioni.com/userfiles/file/fajusozotomusig.pdf
    • http://dotbamboo.com/file_media/file_image/file/mexovatoza.pdf
    • https://godahoian.com/app/webroot/upload/files/tixebanek.pdf
    • http://www.samuitns.com/image/upload/File/bilatulimolaxemamerugiji.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a8dd126a---87644567722.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/4eaef84ca91cfe5183c2526b4f68802e/90198612193.pdf
    • http://dvif.fr/userfiles/file/64839568120.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8471d11726d999b171e2bd55c9a56460/54631361867.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/27679905fb77386bd90d310a2307ef29/zudejebefo.pdf
    • https://nvsrolko.org/ckfinder/userfiles/files/56610353258.pdf
    • http://chatyzvule.cz/uploads/sadinurulurowezit.pdf
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/16593136910.pdf
    • https://ytdrive.com/CKEdit/upload/files/43586428883.pdf
    • http://kco.su/userfiles/file/35722447085.pdf
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/vilivulof.pdf
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/70425257472.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=counter+strike+global+offensive+cheats
    • 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_off0000dc69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 16792 bytes
font_01_sfnt_off0000f47b.bin
66e2d57ee635266ab0b3acbecf8fad6da8eefb3da10bc681c733a51e289c8bb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 18400 bytes
font_02_sfnt_off00012497.bin
7ccdf1b474f420513930ca721be8e341a839b56bf70c3358c3ba7006b4451854
pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 11044 bytes