Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c82bcab6a73afdf…

MALICIOUS

PDF

69.3 KB Created: 2021-09-23 19:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09ab71065b66212b65857fd1f0a5417c SHA-1: 2cccd9324c1431f9ecd469e1986db8072f1d3ce4 SHA-256: 9c82bcab6a73afdf5ada3036a63afd828ee9d3b7fc163642cdd02ac5e8df2ae9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting, likely to distribute phishing content or malware. The presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=matrix+reloaded+online+free PDF link annotation
    • http://mcenterdk.ru/fck_editor_files/files/79543086949.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/98d6b3f76f9d49895d12b61a87796258/26101432931.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/75108109228.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/75616443463.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/99703361591.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210918_155213.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/gigejivogevoxefuf.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/pulugodidemuguwow.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613eec23cf3ff---99723121227.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/87911684622.pdfIn PDF document text
    • http://kd-council.com/upfile/files/zonajud.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/bafas.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/5726770097.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161305af9735e3---kapalerelijojos.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/34315086238.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/93861634174.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/podupomebibenufedegidexu.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/muxedu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147b3caf28be---27169429517.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/lofivuzugonirigenaxupubir.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/gimuzuwinamakefeke.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/zixepi.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_off0000b255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB255 15160 bytes
SHA-256: acd9867e28e5042842672046f04bce9ed0281a106fc56d0e47b354d89e3df0a8
font_01_sfnt_off0000d86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 10276 bytes
SHA-256: bcb0504be9dd9270139f9bec02f3cb64f5ecce8f020397b49a1cf733bb71565c