Malicious PDF — malware analysis report

Static analysis result for SHA-256 a531ea17a9f76bb6…

MALICIOUS

PDF

85.2 KB Created: 2021-07-16 06:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e8cf35cd7c1977145dbaf6e32ca4875 SHA-1: e9d98762e01ffc5937054beac4ca56fc8304c77f SHA-256: a531ea17a9f76bb60ac11a4eb75d008065d1500db84435d03ac8f5a9d5274c70
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body was unreadable, but the heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=european+instrument+for+democracy+and+human+rights PDF link annotation
    • http://orrizon.ru/images/file/xiwile.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e25a20d9f7ea69869b4f6f64e5a26cc3/34381162967.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813aa1a87f9---sotafurawijonifekaju.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/s0fg910prh4dujmpdu7p1rdiht/timiwakamixozo.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945c7241a58---50907679566.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/d88d5c5d620eacbcd93aa95e16c83d35/18026922638.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/sileviterezififobivokopex.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/wisaxelabopufa.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00655ee969---wivopirogezagek.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/86066596657.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/xijabukitepezozodubujuwo.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/37cd524a90712bf731fd5cd16599e728/zusudunazasezelutazovuwog.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/tg6dg9teohnn5ae54faqkd3ek7/tejuratis.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/pibixaxeberinigufovotakut.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/54438905002.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/tudonulav.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/e42dd114f3f061f4e909824ad6398d35/79615803430.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609405a63de1d---vivamevorerilumufod.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/6843456ad785efa5eeda6b6506ead700/79876145820.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/onctvkinqfisfj3orh5j6d3sv7/65637012440.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/27773398740.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210608_EDE3BB3A6F25102A.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/b6971ad4d2e0cd6b5d4c6a44b4465e60/megisifupop.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/girujib.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/bunetakegesufarero.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_off0000e950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 11220 bytes
SHA-256: 16c68f792648f65fe99fcd98046660494af2f4a284a3902fc213703e7e965382
font_01_sfnt_off00010338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 16996 bytes
SHA-256: 8606c064a0d658242d841de764b0af8e9a9dc941e500678789d942596f550b94

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