Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1df0940ee89f094…

MALICIOUS

PDF

86.3 KB Created: 2021-06-27 20:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe0d3351155bf0549f7ed8fa9e9ac14b SHA-1: ef507c4bd0fe04e9124fb1b4d8d01cea50603911 SHA-256: d1df0940ee89f094f5dbdaa1b6af2c4cdd885e0d7e01fccb5d080a8c16a8cab8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support its role as a malicious redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://catamma.ru/uplcv?utm_term=day+in+the+life+of+an+anesthesiologist PDF link annotation
    • http://barrybusiness-crm.com/ressource/devis-photo/files/51745120566.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ffddb3f1---xekelosipiripupumezazi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e7a8bb254ad4437a9a013ffd6336233d/95729698083.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/be5c7a6794e0b48830c3f9462f5beff9/xesojed.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/176ff3e46f7bfe42ae51e8a890924b49/98311519679.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/tubukavawosowesenumukose.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076669b47d3d---panofubeloxa.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/54ii9jfcpimsaq71ad2jak3oal/remakor.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a7235b82a---56515250705.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/sedomideret.pdfIn PDF document text
    • http://dzbnf.com/upload/file///53345555912.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad0cf3809---lozorunexusirilalo.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/470b18014d5841393e68647f481b6a85/tupozojovotebar.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/jewiwarokaj.pdfIn PDF document text
    • http://bdn10.cz/files/file/votefomizukiv.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/82670804350.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608641fa8a6ea---28463981006.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/daxakifajijojef.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160791c9c6f921---90164383048.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/31022740622.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/xibadiruligasevoxat.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3067ec63---55466643893.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706615cd3a4---80953276431.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/kuligomigujuwimuniw.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/54005316530.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/7846727980.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_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 17028 bytes
SHA-256: e8cfe01c2141b7ac3dc70a77f4e5173684daf978364ab12fbd5e33bf92f462c3
font_01_sfnt_off00011b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13365 10508 bytes
SHA-256: 98efe76ddf6e12fb387e7423aa49baad2b2f87fa65f51a3b8bd438ac1a596b91

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