Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce551ba530d8b447…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 10:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 885112286022cba48cd4f5a4c9bd1218 SHA-1: 7fe9d96ccf3191ee6c994027027ad04818efc7bd SHA-256: ce551ba530d8b447cd9702cb354fb4af132565d64d1d1cf8f2f99de5db25e01b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The file's structure as a link farm suggests it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=the+philosophy+of+social+research+hughes+pdf
    • http://nuraski.pl/wsg/userfiles/gajolisatigavozol.pdf
    • http://www.binghan.my/userfiles/file/latowazipiwisanakapo.pdf
    • https://loctra.net/userfiles/file/wunuwamexapijixi.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qdftr9qj5tb2d2i7rhmv4vblj2/69427605667.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/dutodozeji.pdf
    • http://lasfyy.com/uploadfile/file/20210611085402625.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ce78a2d42---434188759.pdf
    • http://bocghebinhduong.com/media/ftp/file/99234826829.pdf
    • https://legouic-peinture.fr/userfiles/file/42736247950.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c80c0afabe---naromupujekonifevi.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106479258a47---sudazitavi.pdf
    • https://www.nitdgp.ac.in/uploads/userfiles/files/50923232258.pdf
    • https://expomediainc.com/upload/file/98949724131.pdf
    • http://rajskiewakacje.pl/userfiles/file/xujetabudalufufuxuli.pdf
    • http://lesmashclub.com/imgUpload/files/99050581666.pdf
    • http://oxigensupplies.com/shipinc/userfiles/files/80829477192.pdf
    • https://standsimulator.com/ckfinder/userfiles/files/tuzepatewev.pdf
    • http://vimbark.sk/editor_uploads/files/20977758903.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/qba40ku24dlehqih68kb1qjh69/fosubujefapusugugesupe.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0975aa050---fupabevirugig.pdf
    • http://ombs.ru/uploads/files/62730514655.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ea2b957e---92745637238.pdf
    • 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_off0000eeb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 16792 bytes
font_01_sfnt_off000106c9.bin
406915584724f3ba00d0613a3fb34c1cbc76526c7ba45282c51a058576290c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 10876 bytes
font_02_sfnt_off00011fd7.bin
d9a2117dec6a03594db8e8ec8b4a8e00960ef22cf24aa0549afb04eaa8d2d74a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD7 18092 bytes

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