Malicious PDF — malware analysis report

Static analysis result for SHA-256 a385996aa1f11f1a…

MALICIOUS

PDF

67.9 KB Created: 2021-09-25 03:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bec964f37886230d9d43a86d92b1702e SHA-1: e6fd501b7fb890d90c0f2cc8a3ac029aa8d490e1 SHA-256: a385996aa1f11f1ad4b466cb7a4c40f97ec7a79cb158225742239a8e42152f2f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common tactic for phishing, with embedded links pointing to compromised WordPress uploads and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or further payload delivery through the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pistant.ru/uplcv?utm_term=life+size+full+movie+online PDF link annotation
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7e238a44f42bd9083bbf2693dfc685a8/35062422519.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/68899931305.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/3403138647.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf36981ef0---lekud.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/88069402743.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/fevebunovaf.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/bogeguxexetawibubago.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/26599398404.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/30210317865.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/72204644178.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/70271336207.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/22089233781.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210923184802.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/64950890237.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/xibaxatibikatu.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/20458970889.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614dcf66229f3---tifazagam.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/dejudozuxigitivi.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/99768809222.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/gukuvo.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/75105331268.pdfIn PDF document text
    • https://wmu24.ru/media/file/16930581933.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/xotimeralizesanuke.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_off0000b05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86C 13932 bytes
SHA-256: c952c1acc04c4bd95b9254bb0ab1f3e0704247e00587c878863e2c9675bde2fe
font_02_sfnt_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 10200 bytes
SHA-256: 1e5df6164e60b11e4a889c1fa6a6523367455594b4457c10289a371832307bfa

Open this report in the interactive analyzer, or submit your own file for analysis.