Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be7438d372ccccf…

MALICIOUS

PDF

79.9 KB Created: 2021-08-16 05:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8389861b3c183ffd7b5055cdbf60bce0 SHA-1: 967c67c5f26eb9ad0efd97666b2e8e3db7b505dd SHA-256: 9be7438d372ccccfdbba343a85aee76b28bef4756cd463ffa2f51fcbff14bca9
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple external URIs and the overall heuristic profile points to a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=mx+vs+atv+reflex+cheats+xbox+360+unlimited+money PDF link annotation
    • http://www.asslar.de/downloads/28823252010.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e9293fbed7eb3dcd14a3d0263e6277d8/66508699721.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf98577a1b---bobukesarusilutimulikax.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/6c958f2cc9b051153f7cf8e2d559cec5/zabulifamogadux.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc77a2d79---14650056234.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/23098553926.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac95707b53b---2312318599.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/kowipemajanijiruzag.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b3665be2---zegoke.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/82589760977.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/wonolinolileterukajudava.pdfIn PDF document text
    • https://fultoys.com/userfiles/jolivavodosejenopodode.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/rasejutotewaket.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/28342626854.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/bigojabixarasezivoxalimi.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/bisadupuzenajojupozafu.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/jawokugabe.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/8632900829.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/jiruguv.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/nutofuwuxe.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e2dd0457---bonom.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/zuxikalofuzexelekudem.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b66b702bf---39960119058.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/55777927563.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_off0000d0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 17172 bytes
SHA-256: 10327bd128bb66952f44dc0950020bb7bdfbbfd19112e470b89acc764639167f
font_02_sfnt_off000115ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 11716 bytes
SHA-256: ca57f389948807eb2a238c6b96bff61021c79432689e77c36a194c7c7de756ef

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