Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27715292488d6c5…

MALICIOUS

PDF

87.4 KB Created: 2021-08-21 09:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bf48516455e07651c3cb42d1843cc266 SHA-1: 2f5b3b3f4cca4be2b6f10b6ab02c7c660b33c246 SHA-256: c27715292488d6c584e8ebe57b241e8440ad96b516bf465deb434cef544a1e87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate effort to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://synerhu.ru/uplcv?utm_term=scholastic+reading+comprehension+grade+3 PDF link annotation
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c746ac901b---69929629576.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/95b3aa3611df797ff57a18a7316fe3b3/nekukawipa.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2degg9iub6t83g68864b0m19t3/nimipesi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/08a3a80a7dc917dc63511f1b1a45972d/64302901585.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/43605254334.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a0962ed28---64419960630.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072b6a8eaf02---dipivomogifoni.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607535024b185---96537183833.pdfIn PDF document text
    • https://hirurgija.me//files/62887770252.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/58106305555.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d78008d1a98d338d9948104c7f3f4ba6/33628676972.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac4eb18c67---wodiguwutikewuzudo.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/loborogusenagaliravik.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/75366957765.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/20244704022.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/iqapo01eqt50nso60gbntj9ove/tisebupuzimotavaziloripo.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161011acccc1d9---79043691842.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/gcrdict3fgcok0t5tn5rdsofl5/73714219884.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/17125986173.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/200600169962.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/kokag.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_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 16340 bytes
SHA-256: d9b1b0ec1eaddf92f700d3e8a6893b3e7dfa8c2723830bc84d5a0d6ca4bb43bb
font_01_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 11208 bytes
SHA-256: c3086d5fe975a84bd4a82b0ab12e842f5fd236c4c8fa985dcf532e34c96957b5
font_02_sfnt_off00013763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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