Malicious PDF — malware analysis report

Static analysis result for SHA-256 df641269d72bdd60…

MALICIOUS

PDF

89.6 KB Created: 2021-07-30 07:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f59172bc8ecc3b23fbe414b8c6af0532 SHA-1: b7de5b6770d72587a63c5b92ce254a6bca81dd64 SHA-256: df641269d72bdd60dd78d260f33c7271dcefc356090e3b3068b57079b28b7a07
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to manipulate search engine results or lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://wastran.ru/uplcv?utm_term=best+free+music+player+app+for+android+2020 PDF link annotation
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783275155bf---kixafaxoxosegofe.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/64613541933.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/9ae119f034c0e40fe6e47045dd5b86c1/detusazoki.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/981e3562c59fe65793cdf84761db680a/81106476294.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/jezona.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/22797175924.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/17776004288.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/6pf9hlba1njmjrdcn4tatad1t4/ziwobe.pdfIn PDF document text
    • http://euroinstytut.pl/galeria/file/berirokikil.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/beb397cffc71c688b8df7025548c5856/jedige.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/pirefex.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160700d4007cda---1462181481.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c62dc749f---35567217552.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/pabifojedisogimowelusox.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d368e6a0c3---wutivonovoz.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca495470d8---734994158.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607efdb9c6440---mivepuxax.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d32288b8d1---89922983584.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/55624711709.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/gojuxatano.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/be9eb49be4a41b46f849db721a49d078/verogitexuzogekofome.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/50962455524.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/tasiwifunizomijudironi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/eaca6526008eced89ad78bdecc2d644a/96502324923.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072840d494de---3004917631.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0d2dce5a6---siwafo.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_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 11288 bytes
SHA-256: 610e7ba6cd1f3078c5224b58a1760173d7aef96b7d4d45bacee2deb8cc731afc
font_01_sfnt_off0001132d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3F 17252 bytes
SHA-256: 92eeb1e1111bd39e582244f276e438625a3cfa4a930d92b31454db8918fb4446