Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc095bfc89bb78c4…

MALICIOUS

PDF

87.7 KB Created: 2021-06-30 01:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f46f9f709a94ee34ee4d5b78de98bbe SHA-1: 2cd7d00678f7f72cefe986ae91332046e459fa73 SHA-256: dc095bfc89bb78c43f16c481fbfb3ffe563fad3feb9e5bc614599b53b36608fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and utilizing UTM parameters, indicative of a link farm designed to lure users to external content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://too.kg/wp-content/plugins/super-forms/uploads/php/files/60b15e0884acf7756325de3372a0e1d2/jazevuvapojipoxotifamimo.pdf
    • http://beijingbeat.com/contents//files/72752435517.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b004605c0e1---49789832873.pdf
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/87347869258.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2440ae4e1bd170da03589e6a50107721/gosazisakenepu.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/a1ju9b95t6vtmbq73cjss0ieu1/31426084463.pdf
    • http://langfordfinancialservices.com/userfiles/files/fuxij.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff64f18bf9---sexabedunisizade.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d044442c6---kasadugef.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/jvmekoe0bismf9822seirhmee2/vinerujomuzilevuno.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/obogk06d8ieqmsrun7o9sd5rem/miwed.pdf
    • http://geoplan.su/userfiles/file/78288519200.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/bjl7gtc1oj1nq5af3sotvbbfpa/34959799690.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2c760696---21421478028.pdf
    • http://affordableadobe.com/ckfinder/userfiles/files/63457261303.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/3pe5j4haekasjcdcpv7knml9q1/5627801511.pdf
    • https://avgdesign.com/userfiles/file/30455365897.pdf
    • http://agendaalzheimer.org/files/galeria/files/dadubonadebodilunuwatili.pdf
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/xijorijamovog.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/1k4d3vra1rtvv0v10b85h822do/25081730945.pdf
    • http://aldara-latinoamerica.com/userfiles/file/3955154957.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b806604a7b3---26212901699.pdf
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/64409587664.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=xy+coordinates+northing+easting
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a82703ace6773dee7e5023e9cb6ade79/1764128857.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_off0000f25a.bin
a22f492c071a7f63aee5d951db684005a8b63d5e890a8125f285c51d8e581dd7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 10724 bytes
font_01_sfnt_off00010abb.bin
6903147ff51606e1f67339941c831774faca6fd2cc125e7469de3fa48ace968a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 17704 bytes
font_02_sfnt_off00013968.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13968 16792 bytes