Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0a35ef9a9d48ad…

MALICIOUS

PDF

82.5 KB Created: 2021-08-26 04:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1eef7fa63d8aa7c2f692ffead2e0dd4 SHA-1: a9fa91c6e3806151b469acd7e047f1257cc85855 SHA-256: fd0a35ef9a9d48adc3d53ca66c3f7ae3edf18cf6e31d81b1cfd63e74eb9fa5c3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a320afa0d52---josumujajikemezujinuwejeg.pdf In PDF document text
    • http://beijinghuojia.cn/userfiles/file/28691525563.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161068c87c0d04---56587894407.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/xirisiveluz.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/73629879353.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e9155abae62---matevopim.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/281e1e11deac1970f145e087857071ac/94793972710.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210730054323.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/dovagagu.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/36541455732.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/gnbfqjgg9emiasltr82lucbj7t/guxazunonixuke.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/95927983625.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7aa8ccc0ac017b73614ab6da2d847489/bimuzegilexoxagavizimu.pdfIn PDF document text
    • http://alptw.com/images/files/vasukivurirawizezotubi.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/atdr4m46vp24itq3nml5efer72/89754347229.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b2897233af7---veribavepebixak.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/82660569813.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/gs7jhrfu6ue1sgv2ehi1pitbm6/sivigu.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/topedevopenatipalezexe.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/17875253013.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/zopimuwekanowojorepan.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/fuvipamekibaluwib.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/batotuvuxujagejepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=active+and+passive+voice+formula+for+all+tenses+pdfPDF link annotation
    • 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_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 16412 bytes
SHA-256: 0667b11b06a884f13cc9875b2217c89e8d2ff0898f6078b97be4e3ac31aa8036
font_01_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 10928 bytes
SHA-256: 1db876eb8b32896b58af5cf4f46d7bca65681226f7d46f17f61c2dcb1a92db0a