Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac52fcbfcfbdbb1…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 03:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f573acaac7b4396741517872374985f2 SHA-1: c88cd7151686f4b19b6bba8cdb55138575763a4e SHA-256: 0ac52fcbfcfbdbb184cdfb4139797ebef508bde31a68e8e7aa11f9f8fa46d228
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous links pointing to compromised websites, including WordPress installations, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content but containing embedded URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3a4dd68682561cc595bb13dbcddc5ef8/sopazolixagikoj.pdf In PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/viraxinowexawi.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210511102231_324328018.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/5093849136.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/pogikotumaditinidu.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/lafevom.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3e75e14a---397500412.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/dm8idmfklvidfummo0jsl8n17o/taveweributab.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ae29fe2e1ee0206c881e998afa904233/13510026567.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/jopetutapiviju.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e5bea015f---29084619230.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/wewatelemusixaru.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/vr2a4dnv81pt09os8t9td9546n/605227597.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160926cdb83512---jupuz.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f814e5dd---topizidoli.pdfIn PDF document text
    • http://demkapi.com/resimler/files/61075154614.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/53100399585.pdfIn PDF document text
    • http://otczenacts.com/media/files/4483714468.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/mijelodabagosedir.pdfIn PDF document text
    • http://omni-links.com/94214688154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=chinese+astrology+book+pdfPDF 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_off0000d000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD000 11156 bytes
SHA-256: 9141bc37e6695190582f28e578ebb58b4a3d85a14e65c65cf60db682107242d7
font_01_sfnt_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 17348 bytes
SHA-256: c8184e911664c44a4eacc2b9103853c84aab1c101fc1acc74dfbf00264792284

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