Malicious PDF — malware analysis report

Static analysis result for SHA-256 892e34a901bfcf5d…

MALICIOUS

PDF

71.9 KB Created: 2021-09-04 08:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2c3b13a114e69d82132af0537b1f52a5 SHA-1: 3e7ea8861127022be039cb0554de14aa730da7da SHA-256: 892e34a901bfcf5d3d6d6a6ad4c7cf39b1c711f24e40a2dbf1f8bb5dcf39c635
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to compromised WordPress sites and 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, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=halifax+mortgage+rates+pdf PDF link annotation
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160972a398b706---wexedozim.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b23aba9d2335c61e89e6c4593086c111/51963590058.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fb53be7ffaa---36498528019.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/rir4ag4us9kmqmo3bk0kjuno22/56092583616.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/zakakafilibutozepetud.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d4aed1b9aea818aec4f5c39e2077201f/35762894955.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/2674015114.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/jomomejesevejiwa.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/71448499743.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/39159734291.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/83266003387.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/82da1d53ffd713c28d803c9ecf3082f0/71340315715.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/96849240286.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kejofotewanikadumabuzig.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e905c9eef38---zumujejub.pdfIn PDF document text
    • https://ghnservizi.com/file/87754660666.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/tetaroreme.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe9e89f16---13825526931.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/9197442820.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/gapakedubukarikezopal.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/vimoniparew.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pj4jvfcj1bd3ijcrii0523q1j0/84657504634.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_off0000b8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DC 16008 bytes
SHA-256: 6ce9b7d3444a92efcd8318c31ca4f9758c9b35481ea8df2b7b72c86d5ea23c75
font_02_sfnt_off0000f9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 10828 bytes
SHA-256: 2d920bb8fb0622f5e52560e5c9f560f9c5c0e4a9adcf7074cfa98c5e0d36b7f8

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