Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c863d9f13b5574…

MALICIOUS

PDF

86.5 KB Created: 2021-07-19 13:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b8372b88080a7dfbe7729ae8cfc85fc7 SHA-1: de4ad791baf2f718ad9169707080324caad8fa06 SHA-256: 66c863d9f13b557403cee9c0e1d0d394f92f5330215db6a4e4bef021ee40f6db
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

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 http://aelma.com/sites/default/userfiles/file/vefibutipelakomamebamat.pdf In PDF document text
    • http://fkhd.cz/data/img/79420875596.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/a6a7eccb7f017dcee6ca2f2a3b0f45a4/91711741559.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c1400d893---34500418013.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/35248040211.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/62641527947.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/13194539271.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/26815517057.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/24a4e19ee190e2a5fd74b77ddd24520e/85810950841.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e05cecd9688---buxanefazarimugesavinoni.pdfIn PDF document text
    • http://nb111.store/web/images/ckfinder/files/20210610070317.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/vivimoxunu.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/11714591010.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210716140506.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/aui8j5lne6m9r8gm7t4sl7bujt/dupazegisupogufi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160aba8ae11dd4---89818597332.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/81830240267.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/811e6b43a17b52f8e557cf2797b7a027/5232517475.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/f9oifao90nohvq6vpera546qm5/79221503673.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b64fe68a304a5b21eaf9d9236fcdb421/28059429593.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/qf742nibilnr6ihao5ek22n5d1/zijenufepixadukoxu.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0bc1719c42f44e92ba97417e87f123cd/jijipokofinopinuno.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/92348643398.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/fikilamuzetenupopigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=3+number+meaning+biblePDF link annotation
    • http://irodori.kir.jp/files/file/wegetebomuwatiwis.pdfIn PDF document text
    • 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_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 10380 bytes
SHA-256: e98d89190212bdcace0a04db129da1d88b3f03e496862de020ff3fa5bb5a9151
font_01_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 16868 bytes
SHA-256: c93209dd604bf7dd7a065753c7ae1024565c1993eaf4095444fa87d17d335c4d
font_02_sfnt_off000134ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1