Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b6551d21c6c187…

MALICIOUS

PDF

76.6 KB Created: 2021-09-10 10:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 29c05ba97ef59c6f1c724bfa23ae4f81 SHA-1: cab83aae99751739ada21f8c55ce37c57c880568 SHA-256: b4b6551d21c6c18725ad3330eee9b15955f97587c4a82d1766f041bd9dd0033e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt, consistent with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://tecnoservizi.com/userfiles/files/36199311479.pdf In PDF document text
    • https://digireg.dk/upload/39321758838.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/612eef77ca335.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/zikowuwotajepivomat.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/41714105965.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/24800702289.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/296thituapondnp0uagf5db9us/gipalaxavu.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/57715205641.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/lerabaxagefanotomadina.pdfIn PDF document text
    • http://speckrepej.com/upload/file/depasimisavajijemoda.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/jerajuxuwimumato.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/kugozogesajibodora.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/nudanunoganero.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/3445914560.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4a8d2fcba---nakulubawejevuduro.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/7c0bd7e1b533bb6559947d2dae19901c/nurituvebotike.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/mokumalijuregabolizoma.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/sererafasafuxolojeg.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/3bc8b9215340db99d63c0ba3b2922f38/62063887778.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/garijuxudoraxarijirotusev.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/url6a2vgh7fs94m0c8d1tkrkor/19060909075.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/53soqbc94qag8tsdiip03gd025/nemabex.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/rezutivowulari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ghd+sports+pc+download+appPDF 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_off0000c9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A7 10512 bytes
SHA-256: dd418529c2af7ea8b64eff26ad90436c04fe3c52037cf7614a011afaa3358e0d
font_01_sfnt_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 16876 bytes
SHA-256: 092d456a81fed15b8feefa62c22109c01dc7777c839c055f5fd092c9506925cb
font_02_sfnt_off00010d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1