Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a56056aad47c521…

MALICIOUS

PDF

102.0 KB Created: 2021-06-27 01:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c9deca10d56aa4ee7c798b0d61c67a85 SHA-1: d016c6bed6b6d02244418d0f6aa676efd1700cf9 SHA-256: 0a56056aad47c521e6d9c815813987b6486bf504d0e430e76d7e29a2b267777d
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 links to external domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://asfus.net/virgsurv/userfiles/file/vukobe.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f1f93cd981448a70c400fee53caf719d/rodunoloredisorovivi.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/23666157924.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/c52776bc4c93b9d1fbc9265b71e5fdd6/34881085637.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/pubomogifobofuxa.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/605011593.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa0feddf80---89238372836.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/73759578744.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0e746df7fb7802b6988b026ff4e7f20b/guripuluvelepoful.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8db71ef7---welolafederafosol.pdfIn PDF document text
    • https://arendic.cl/files/wajifezogovexo.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/93f475ab11f6636ad631223f2f7c1c28/62735014086.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e481a5aaf---tusavemudukes.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/zavumodetubigo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b00cf256df---lonenos.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/19996d803d02290713290bf820bbe5cd/65250725591.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/watuj.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nfppj2luam1brbrucg78m9dqa6/natuzutesizedek.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c24a1a2f5---pimus.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/kinedavibi.pdfIn PDF document text
    • https://rintrans.com/files/64032371433.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/wozuwedikadikejorukarekum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=aphids+on+helleboresPDF 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_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 10352 bytes
SHA-256: 2ae7857896ce236af8e0f94df08e5d0478b31629bf08a46c64275bf7c8ebc385
font_01_sfnt_off00013bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153FE 21436 bytes
SHA-256: b5248a0ca3f2c13360726cd4e4217faa69a8aff60683b196034866901b2022bf

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