Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea88c0884d5a906…

MALICIOUS

PDF

89.2 KB Created: 2021-07-24 14:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cb40c0499cfa6113f38f570fbf4fc104 SHA-1: 1b399c2f4f113e5491cd79ce543afde175621b01 SHA-256: 7ea88c0884d5a9063418d389a88b91480c5ff88afc17447b50cba10835ad8ecb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple PDF files hosted on various websites, suggesting it is part of a phishing or malware distribution scheme. The presence of numerous external URIs and the nature of the heuristic firings strongly suggest a phishing attack pattern aimed at distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f4b1ce6209e844ee8ccfa68dbdbf8f91/tubuvilamurunagogaga.pdf In PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/djpnvoikd69va0nl501vpv01fe/14492205121.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/63596802133.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/mukinoxanupuveginamewufaf.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/15620000021.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf960d7ed---42929274712.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/juxarejalokelutuzasubex.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b146241aa8---1659639884.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/1002044471.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/70869658229.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062017112670554.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ns26nifka6vuvpa40d4atmj3s4/53729220696.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fipaligadogini.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe0b4e1de5---15966074514.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/16497817904.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c64bce72---zadamidobutirufomowosubaj.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160771d5c949f5---rabekusuwivogufa.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/88kkrtiorplcp3tld014kusbi8/89210801002.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/01c4482fb9076ec799cba7864eb7a0e3/44197108066.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/65321022383.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d4366c318b08457bbfbbe86bd79e46a0/88522099452.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/fed35efcb2df4996a901ff5231e32b10/57767244345.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/f9bc08841d30529915a2b3558f288968/36664419963.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8c7561e69---xaverugapuselad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=indian+interior+design+books+pdf+free+downloadPDF link annotation
    • 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_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 10940 bytes
SHA-256: 3813935afc1dd528b9c6ca84ffdb02f739e9d92d6dade5ab81f7d147d92a7099
font_01_sfnt_off000111ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 16936 bytes
SHA-256: 6f9b9b0d59da990a811b34cef1a98e8fda9e2176476d54d29cace39bbf134d8c

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