Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89f22b5b8593162…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 07:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9147319b3aff77735eb1929313488a8 SHA-1: 8b9a920d772fdc7298ed8237a0e3a1b03ab10cd4 SHA-256: f89f22b5b8593162145cc06f9d71f5568f6594485d3b4c59dbc8ef5cfe7f8206
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and multiple links to compromised WordPress upload storage and disposable hosting suggests the document is designed to host and distribute further malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a deceptive lure for payment or invoice-related scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143d79213acf---55808038475.pdf In PDF document text
    • http://proallprint.com/userfiles/files/kamevuderowinatevisuwup.pdfIn PDF document text
    • http://medi-sen.com/files/files/bipuwekinesukojimasopi.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/71731003308.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/fusamobupezojame.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/gubewiruwomeli.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210902071550.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134ba430bbfd---vadazuvuj.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/gizumuwefibez.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/gulisunos.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/52599234681.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/75548878829.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/13978804502.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/97d001cca8edc23056ced70a99599946/53950213189.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/17211520251.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/23986756383.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/53184985816.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/surififofa.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/17m6m2ers9v82lvmh64eig8s5p/zavokodiwuvajekanimoziluj.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/14519503310.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/zejetonowosinokafuju.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/77134351106.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/wuduxifuwajusanew.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c1ca8c54965429473ce4882cca8f03e9/bafuxufunoximero.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/87233261410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=advantages+of+modern+technologyPDF 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_off0000d60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60E 16420 bytes
SHA-256: 35866d7660957d5f1a11c43b6273798d51a5b8ae426d024bb447a02630314019
font_01_sfnt_off0000ffd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 10992 bytes
SHA-256: a866dc52f0cc4c1ceb17388569583f0e996362c94f160c3ce7e1b44ab832b7da
font_02_sfnt_off00011919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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