Malicious PDF — malware analysis report

Static analysis result for SHA-256 b402549d72897fe7…

MALICIOUS

PDF

150.3 KB Created: 2021-09-01 12:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa9725291af1de7e7e652265dddf1238 SHA-1: e6adb4828cb23ffe72808f4f19563297a3c94225 SHA-256: b402549d72897fe763faa195ece1d4a70ce0bdae5bbc029970efe45d078971cf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. The embedded URLs and PDF structure suggest it is designed to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ducthoaudio.com/upload/files/41885322301.pdf In PDF document text
    • http://fusiongrup.ro/userfiles/file/20041204477.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f597e3ba2aa---vufofumik.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/jirojefizedowujezaremebo.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765bfdd26ce---xemowuna.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/266889721610b8922931a5.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/xopuwebabegowiw.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/77601014716.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a67888f5---17696745993.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/21094746450.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/milodositenawe.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/lorafekelogijop.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1625385330.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/66425030650.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2fbd55fd0bb0d7752675e2437c19f15f/21218254169.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c3abedc06b3---51139317077.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780fb402f2e---65050765488.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/kesadivatafifipulu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7e5c85af1---vusezefematepewaneb.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/58ser6smgc31fbvh62bissbu45/46728023602.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/70165857147.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/vumamukasebebafanaja.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/xijulegot.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ddc9d6095---ligab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=melodrama+meaning+in+tamilPDF 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_off0001e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2DF 10416 bytes
SHA-256: c8048cc5a668966ae94646730b26c449aeef3e2631af41fec623bbe6808cbf83
font_01_sfnt_off0001fa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21241 21992 bytes
SHA-256: 1f0721127249ab69d9a6fffefe9c45cbf53f562dd0f94a10b79a2d295723810a

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