Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6674f4cfb53bcd…

MALICIOUS

PDF

92.6 KB Created: 2021-09-21 13:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e956269d85fad63dddb48c6301542343 SHA-1: ab6e89d744bfe891fc448c7e94d8fb0d0fb4726f SHA-256: 4a6674f4cfb53bcd2e39df7d081e76e60ce11b09aaa78ef4faa3f090cc0ff58b
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress sites hosting PDF files. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick the user into calling a phone number, consistent with phishing or tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation and further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • 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://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140e84cd491e---rapojiditujegopegedaxati.pdf In PDF document text
    • http://avvocatogiuliani.it/userfiles/files/rekorotugovume.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/gufosokirigowebuwepuwidex.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210905_053427.pdfIn PDF document text
    • http://protezas.lt/i/File/59874815656.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03f484e5a---dojurowet.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/65780374712.pdfIn PDF document text
    • http://innotack.com/userfiles/files/7753358881.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2b67460a6c3cf804d6e7b168a2a07b86/tijutipotero.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/11981d732303390afd2bc7fe2d5ba0b5/30103744878.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/vazolunabe.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/55158094636.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/735acf64b5ea2c0a2f31467a699868df/sizariwifajapoguse.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/10051539359.pdfIn PDF document text
    • http://vecsecity.info/editor_up/lotizi.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613828d6183a7---lodexinakilifagitugewimi.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/kodibarovip.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/ludotukukujitowirup.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/chut53ne98agjv1t6hegqnf1ai/pifuvibotizajomezisopox.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/28331673657.pdfIn PDF document text
    • http://timocomputer.cz/files/file/5955131065.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/ganakuvazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+leave+a+voicemail+on+androidPDF 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_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 10508 bytes
SHA-256: 80090a58064fdacc28ff39d06c2f5e4df3401e0ae35e9b30d9c5869ba1651146
font_01_sfnt_off00011dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC6 18012 bytes
SHA-256: e8f9dfa2bc8c72a863a8a7daefecd6d24ea4f00787b15127af9c8f4350011409
font_02_sfnt_off00014ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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