Malicious PDF — malware analysis report

Static analysis result for SHA-256 3530480df38e7051…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 08:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c995d175d1168d426fe45548d91522f SHA-1: 2bf9b72c0c92b3c508cc2d872d44e52c1f31aa79 SHA-256: 3530480df38e705138d803e1fded581deb61e943b54c842b6e237711f99478d7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs and the overall structure suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allineers.morefriendship.com/upload/files/61739678697.pdf
    • https://aydin-elektrik.com/resimler/files/xutisapepi.pdf
    • http://net-marketing.hu/images/files/sawezemobuwegubawelet.pdf
    • http://telesson.net/_UploadFile/Images/file/71940824919.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/819f591d1ade92fcd8abdc47e9ac057a/fizuzokusa.pdf
    • https://clickbox.ro/images/file/21496585986.pdf
    • https://cuatudongsaigon.net/uploads/files/zewenorubutunov.pdf
    • http://satakantaresort.com/user_img/files/76467651980.pdf
    • http://seteo-dechets.com/images/file/pevaworexonaxupifaxolaf.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8434d6542a718a7ffd6ed8efe918e122/mutulusigurigo.pdf
    • https://vetregistr.com/ckfinder/userfiles/files/90740545438.pdf
    • https://priscar.com/documents/files/sowezujuvi.pdf
    • http://eros-arena.de/eros/userfiles/file/77147012216.pdf
    • https://ladachess.ru/userfiles/file/54871386648.pdf
    • http://fcraregistration.com/UploadedData/file/jitefowozaw.pdf
    • http://baozhaopharm.com/upload/files/48400749923.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b902d3d87---35213305249.pdf
    • http://uniondrygoods.com/fckeditor/userfiles/file/75788531133.pdf
    • http://enidental.com/userfiles/file/20210913054654.pdf
    • https://familienbilstrup.dk/ckfinder/userfiles/files/piwexusixurinibijigikoza.pdf
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/perimidivemotef.pdf
    • http://pelejas.com/IMAGENS/CKFINDER/files/35315819930.pdf
    • http://satunatc.ac.th/ckfinder/userfiles/files/jasikupezowuxiriji.pdf
    • http://wuyioutdoor.com/userfiles/file/kinogisexeduxis.pdf
    • https://infotechloyalty.com/bot/ckfinder/uf/files/24624373362.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=price+of+iphone+11+in+bd
    • 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_off0000db73.bin
80e5612347ce740c996b809f2b4b41f6c554863276824223455b69b5cae8f609
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 18184 bytes
font_01_sfnt_off00010b62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 16792 bytes
font_02_sfnt_off00012379.bin
42a2ef950fac2c8257fd619b59cbd6b71cbd867fc602f71ce59de9ac8ee5ec59
pdf-font-stream PDF embedded font (sfnt) at offset 0x12379 10436 bytes