Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b4d217860ad2cc…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 09:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 842dffc48a46bc80ea2fed361dea53e9 SHA-1: 2915028ffc544afb897e1b6c52f668977a438f24 SHA-256: c3b4d217860ad2cc7663025cb9287e1d6565916fc1f82c1dd8500f1b29b3ebf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://cructi.ru/uplcv?utm_term=convert+pdf+to+pptx+editable+online PDF link annotation
    • http://vuatoyen.com/uploads/userfiles/file/84242956075.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/gijofuxogoxubalivabo.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/efaf4d8e61cad59bba1638fe77fad10c/resijufenokubiw.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d98d975f3---jureru.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/e0e1bca48cf1e657e9c4e0ba0b15c488/9376476137.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/tinuwa.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/45783926271.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/l742gfu38nr0iva8bak2akem80/zowokisizi.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/xitadujelataxaje.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/sorutiritokuzefar.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/71391032341.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf21cdfa4---37935033052.pdfIn PDF document text
    • http://www.centralperdana.com/file/zuwujegolex.pdfIn PDF document text
    • http://jadeite.ru/images/file/ronoloxoxej.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/25059975929.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/xurezanufobofanezok.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/gakamufiduzasiz.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/molone.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/rirezabuzekuka.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/68101778904.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/9153427694.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/46910596342.pdfIn PDF document text
    • http://orthopediedelft.eu/files/68485147679.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/88220243715.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_off0000b34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34F 10660 bytes
SHA-256: 6c32893635a7d74d29d38d9d2189cbe02e6d15ee511565a722d94e3c4c08d148
font_01_sfnt_off0000cba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA6 17004 bytes
SHA-256: 149c9e32cbe2886478a80059cf58c6a595a2ba415ecb62d880335ca61f9cb664
font_02_sfnt_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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