Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b55f3d2cea33e62…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 01:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16762c028644186eafc06a23148aebba SHA-1: 95c822db0869f25987ca9785f243b05f35c624eb SHA-256: 6b55f3d2cea33e627cc528c03d7a8c55572363632b317debea0eeb3ac6d80db9
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious. It employs a social engineering lure, instructing the user to install a browser extension or update, a common tactic for credential theft or malware delivery. The document also contains numerous links to external sites, some hosted on compromised WordPress installations, suggesting it acts as a dropper or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://philipsphotographystudio.com/66388382185.pdf In PDF document text
    • http://cafegreenwichvillage.com/uploads/files/bejutozisodifixu.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/76452264726.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/67623784980.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/6ed6603dcefbb9dccdbc0ec976298114/fajisidomilokaniga.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109091145516553.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/dodawawevisasopimeli.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/11204398581.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/35924058337.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/20302041783.pdfIn PDF document text
    • http://learningkey.org/userfiles/11332155426.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/luwuvekogapufeboko.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/452e90ef8008d5f73c6bc0f7b4dfdaa3/4140753826.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/rusakobepagajifolid.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/libisivatarew.pdfIn PDF document text
    • https://betsin.org/userfiles/files/75665247123.pdfIn PDF document text
    • http://24cvety.ru/upload/files/39041814992.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/41904267136.pdfIn PDF document text
    • https://rjpexport.com/files/80094714049.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/67642992905.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/bebupa.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400feb37219---10758197305.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/kafudomarurulolaw.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/tizamamewivowizu.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/rifapewiweruzurolekurut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=notification+access+not+available+on+this+devicePDF 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_off0000c1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0E 10656 bytes
SHA-256: 9ccf2effe81292cf57149577499d6c5f344576950dd78e2aba7bf121828b807a
font_02_sfnt_off0000f269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 17192 bytes
SHA-256: f1c4cd30213381e4c9b372b8fc2c609baef936248e1e50ad0f25619b53e51f7e