Malicious PDF — malware analysis report

Static analysis result for SHA-256 11da41fc5ea0d15c…

MALICIOUS

PDF

84.2 KB Created: 2021-06-29 02:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fc0c56efa2f1a01c0dfd368074b52652 SHA-1: e005619149f76c45db76ff1f8ae0e7b08a495049 SHA-256: 11da41fc5ea0d15c99233a0402c411267cd481664dd8e81c45c7925a996cf514
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://condicionamentofisico.com/arquivos/file/94732360901.pdf In PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa80810e4---kalojafalaku.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/f3954111c938e0e8104d9af308cc7b15/nijuvujezopiwokenexelus.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609033f1709f1---zisefonigaroneb.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca62c3dde2---63846095422.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b649b56d1d5---lugaga.pdfIn PDF document text
    • https://nada70.org/userfiles/file/36159413176.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/japilurevipobi.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/56301898512.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a9c80e3ffd8b2027a250e824d1da88e1/zapedimozodazomedebevalo.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/filirotaroteved.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/0f6bc71f3f10697166aca0c316971b80/xejamewijutawan.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/15137835365.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/nurukowikuwove.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160732dff5557c---30360714990.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076da903c3ac---84907094772.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/55722101269.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/poreregalawejixoxawege.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/92124535723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=single+mother+of+twoPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1fbc068a2c4fbdb83c3d2806791366ac/34283591156.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 16940 bytes
SHA-256: c9273c2fb099c23cd7243207cf20af677fa7599ca950267f881b93f559996bcb
font_01_sfnt_off000112f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B07 10492 bytes
SHA-256: 40a2852d2aeb8034d1e8dbb4c262999c40bbc353c01d6c856bda23bb55d60026

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