Malicious PDF — malware analysis report

Static analysis result for SHA-256 a746495bd2584d32…

MALICIOUS

PDF

101.8 KB Created: 2021-06-30 03:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47889d766e96dac880167c203d6b04db SHA-1: 7c82f4187ab1da8407a53fa40975795d80c2fe31 SHA-256: a746495bd2584d3272014ef72f782422aae50f8eaeccb319878adea54d6f3ab6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160701196ad0f9---49907374387.pdf
    • https://groupburuemas1.com/contents//files/81300528560.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f568b46094dbbf7510cc300bf9555a2b/24531350570.pdf
    • http://klassn.com/ckfinder/userfiles/files/31124207554.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b01cce958ef---zojibolukilip.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb3fa8aaab---vubatosolegiw.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7d72f51c---tapiwa.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/av7uchs35j29pkata80sgi357p/53280350107.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/7950ecd6df0a71f6634f79af04d70488/tusibepirofazekuko.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7522233de70c2f8d49bcc3996ba81c3e/1123830542.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcedcdc934a---mijidotuxawosuxirat.pdf
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/bukezalitukip.pdf
    • http://lws-realestate.com/userfiles/files/44278350773.pdf
    • https://nikosdimos.gr/userfiles/file/zuvisaromusuzu.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcaf58c594---32115962976.pdf
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/21322923306.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9dq18k3k63j9jiiv5bjj29lm4q/63767173399.pdf
    • http://lhdrum.com/User_File/UpFile/file/20210605235457_bmF6ZXA=.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/k086prd2r75109cfr4kfu3e9av/fomoduzomebijawarup.pdf
    • https://ratsimae.eemedia/contents/file/97228074263.pdf
    • https://bisnismedsos.com/userfiles/file/73619066126.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5743c4caf1---tepajaveresurodifinabeje.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/0ba9ce90439953c331fcada984e72a3f/81562439742.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ec43bec4---wurebamekojam.pdf
    • http://quickvideo.nl/userfiles/file/93747932500.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=introduction+to+information+technology+questions+and+answers
    • 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_off000129a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 16792 bytes
font_01_sfnt_off000141b3.bin
274a4c44c3b399cfe9c74bc982dc1a944c5f1ecf7e81f9cdf22359805c71c157
pdf-font-stream PDF embedded font (sfnt) at offset 0x141B3 16808 bytes
font_02_sfnt_off00016d69.bin
7465055afe61c920d0eda9474b76e4edae29565313e14520c5b7d14c22924c8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D69 11320 bytes