Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af5a6cdd4177c50…

MALICIOUS

PDF

87.3 KB Created: 2021-06-29 00:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67f28170157222d4979dd3911d6a7b0d SHA-1: f82cad6509497a17b11d1d7eae122942893045a3 SHA-256: 2af5a6cdd4177c505ce02ee0db9e5890c9755549dd90de11db07ed819f92e71a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://consoles-a-gagner.com/fckeditor/userfiles/file/56941064816.pdf
    • http://filtrydokoparek.pl/img/all/15689870423.pdf
    • http://anhopphat.com/uploads/files/kejoremusi.pdf
    • http://biomassasia.net/data_ed/userfiles/file/pivirezise.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/04ug766i06n4iufldnb4tf3nkn/9988670908.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/lufigosov.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/a85807ac7d41b761490eee86cf6c8926/503290068.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160becb82de757---59546853872.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/17157180228.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c71bc63dab9---34967585130.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b1cdfe1ed8ab3b5d4f9ba1f9518ab188/18265701911.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8c081c9dc---89310378537.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835053b7869---58494656214.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884f7772a5a---sosaponulibozoro.pdf
    • http://atya.eu/files/file/jegetow.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/48512034854.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/e05i7si7cfat42iam0nuhs23r2/mujipelibemejebor.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b4602fc4b---buxerofokomigufot.pdf
    • http://www.chatanakonci.cz/userfiles/file/32656090808.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c5656e54635ccecdda9bd9d8cc691995/dizoson.pdf
    • http://driver-jazda.pl/upload/file/xivoxujufomepepexor.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/67ff61d395c6ce4a0aa9a0fc5b30bd7c/molifowidosetejijoxoba.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609574ef0b384---89644802037.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/v3topi873vevvngh0lfimkvk5n/17080557056.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=picture+to+cartoon+converter+app
    • 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_off0000ed94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 16792 bytes
font_01_sfnt_off000105ab.bin
006f2dc0a80e392be931da190ffd55ff432cc4df28ff53ace42f12f20c868ac9
pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 10320 bytes
font_02_sfnt_off00011d12.bin
4a5a1b1b7acb1a27e8bc7de0b8383bc7b609b99f69682bddabab8cabd82fd3ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 19952 bytes