Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5ce7c58236c8f1…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 05:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 69d4cb0a4dc5628816318581626dd4c6 SHA-1: 18866a3ff96894c659996201239e09ad66fbf3bf SHA-256: 8f5ce7c58236c8f116a1e9699e7e1e1f6fade10f1961f046b8549ecaa08efc67
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7761089b27---48596348679.pdf In PDF document text
    • http://douzonebnf.com/upload/file///bulofumamurimetejeso.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/88486436890.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/6f3f14d82b6a67ec892fcbae3ff8c11e/didota.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160908c07651ee---25684237287.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/93619680728.pdfIn PDF document text
    • https://campermagazine.tv/public/file/wunozigomigilopexirako.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ca60f306cf9042a41fa5ec28eee41661/26887423631.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2032c42aab---benebuma.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/vk8l7h52b7oubfnduoeqeheqj1/86307839982.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/10749178222.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/64151034c0e8c8f01b3c01d6acfb35ac/12690658727.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/23432172351.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/welenipamafozodagelunikop.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/xamitatorudifanejiv.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a0ffd8975c8dc55fdc96806b51bc4e4a/22838404338.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/napeximodokubosideba.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f5bbb52d9996c66f75f210708cefa0b/29615596764.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/zezunomajixaxuna.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/86435139187.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/dikiboxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=kohlberg%27s+stages+of+cognitive+developmentPDF 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_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 17972 bytes
SHA-256: 0b7a1e1680f9a0aa151021e0d71f7015115292fd9ccf12ae1753efb9de2c51d4
font_01_sfnt_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124ED 11300 bytes
SHA-256: 7b0387bdee0e2a254672976f4615d69dcc9ff6eb8be5828271deb9170e850b87

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