Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d9ce224f0af179…

MALICIOUS

PDF

92.4 KB Created: 2021-08-20 22:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bcb5b8f229b64b595455af0bd04e3763 SHA-1: ac0e1e65edf8fe99d220d55b425d6622a4472ac4 SHA-256: 86d9ce224f0af17968739b6cc8eb0966c8cab4751bd0c0a5462cf13fb7db2394
164 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to serve as a distribution point for further malicious payloads. The heuristic 'SE_URGENCY_LURE' suggests a social engineering tactic to prompt immediate user interaction with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://galedo.cz/www/data/cms_files/files/ditevavodebo.pdf In PDF document text
    • http://freeski.hu/freeski/file/84772809660.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a637bb43604---21609711168.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/uuhqk01ho1ij5i3ss2ckbeeot3/zopaduwanalemodasupovo.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb78d4001---fopezavizu.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/vj6l71e6g160u0qc024vng8iph/rumuvofolikapeka.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e3328a550---xuvepesor.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/379fe1b64843d740febbf1b6d2629446/mevesisazapedilemelod.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/nikugezirelimirebe.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/xexekuferurojadewanudaduz.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/if7vmrai8p7bob3qhlb3nsak8p/76692701475.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/fuvopekovixarom.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/72k06dso3lqk94cvdqgbofs4k7/59125976416.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/27a65d6428a9c8869af07ab948f765f0/4824210752.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16097966dd4f2d---66253807034.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/zinenubo.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/17r95bbog30005garqe56au354/54292168521.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/mokoxivemizubebejaxi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834ffe34cb9---bozotavupo.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7d99ac36ccd031e4ec8260938cc14047/zorobogulujenuno.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/07da6cb899452a59bd1c3325296ce047/6350052243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+are+the+rules+of+email+etiquettePDF 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_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 10616 bytes
SHA-256: 366caedf2987547679484694274542ea45fef10e52281654e507c1a1a2ae9cd0
font_01_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 16980 bytes
SHA-256: c61efdbe858a1e09c28824b55b0700131cfb1396f31c36fedd078a0b1dbdfc29
font_02_sfnt_off00014a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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