Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b16e344b39e74cb…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 07:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4f118023909b70a568f5bf00f80dfb9 SHA-1: 51c7211bc039484e6ccdfe86b47dc439e6d0ab80 SHA-256: 5b16e344b39e74cba08cba48b6c1a0338113f24ad5ed7ff1be78eb0bdad0b205
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and is structured as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=electric+guitar+amplifier+handbook+jack+darr+pdf PDF link annotation
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/gq0ou0t2ppp8benbsg261m21m2/80270837142.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/liwizadunasuzeduvewez.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/zefik.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/46640696592.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/zenogulijizoleli.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/lapotejotekikif.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944f280e294---fasewunodadipumadupexiwal.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/zutekefurafebiwe.pdfIn PDF document text
    • https://sealskinz.ru/files/file/vulewajezixonitanolavif.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/50131950495.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b79d70c9998---36433723384.pdfIn PDF document text
    • http://geoman.cz/data/file/78259001519.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4bfb93f61---1064407107.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/pspqdp5np15p7lro64pe2e1s33/sivozodif.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f3bf7f4a550---resafurekopajixob.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vunavub.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/df34be2065febb8fbcfb02265ac029b6/78260965166.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/tovidegiratezoxi.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83bebdcb6---48397441143.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/60376631471.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/51285379330842a4f33aa2ef5a5553b7/23214244726.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/kelusikomasom.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/subizuxijol.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/a52hjkja18u69qsi8s46jni9v0/baron.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/29b875c11cf6b6127eb9552202a30359/17774910750.pdfIn PDF document text
    • 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_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 18112 bytes
SHA-256: 500769a28c4bc3190b3fe43eca50bb2201876e456762947bb584373b8c53fda7
font_01_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 11344 bytes
SHA-256: ea0d24f454ea195a7814a6c45981668987607acd0d59a78d97585fb97bd8acde
font_02_sfnt_off000124c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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