Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf164ba4b34b35e2…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 20:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21bde680a83258dd6fb7b373ab4cfd17 SHA-1: 2ae44576380491f8542c6a1dca0cf03f862fbf37 SHA-256: bf164ba4b34b35e2fdc2d2b010ea4275c2bc6bfe5ccacc944ba3f26ec9f57dee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to phishing or malware sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=dsm+iv+tr+pdf+espa%C3%B1ol+gratis PDF link annotation
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c688cab9d---13116651201.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/radudejekeza.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6303552f0---xiwelijat.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f612cbacda5a6ac96556f7e984350dab/zirekufotaj.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/jalewupotixufi.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/datafositesulu.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/38998955761.pdfIn PDF document text
    • https://subarini.ro/mm/file/bagizegeniteregavus.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/41865612690.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/13089354639.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac52c0dec37---19818254648.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160705ed4eb376---duwer.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7094d6c76---39742953530.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/82444395025.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/latekowegazenepigaba.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d8be6f3b96b566203b97bd38b9ca575c/gusotoxeramadadat.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/u5haqd7toei9pcsrs2l3ejv8ka/48286013916.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/db54b7d3f3360e928774769fd56e579d/pazelivanofopafizeseno.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a801ea9de---51158212729.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16261818600229.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8645115ad3ae069dc6dcca5dca9fbd57/45699082533.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/52416645575.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021515233303875.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/92243712241.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c9d9e5e790dfb48d5c8523460264ac1f/61779003102.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_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 11012 bytes
SHA-256: 5ccd573f99ce03f7484041b6803fd19cb7ddfedfdca9be8a875de8e1c73d4ee9
font_02_sfnt_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 17648 bytes
SHA-256: d0e140fc6ec0d682e155acc9f53da103ed53356dc9ed454bc287fd3237b25c8b

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