Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae951058e8f136e7…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 20:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2eb7276d781ec601625293db1eb9819 SHA-1: d9764dc203c7cef62b8086c76b30400b59f8b69a SHA-256: ae951058e8f136e76e09d0c60746f76b8e9193051daa0ca60c5e0dcd1260361e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the nature of the document as a deceptive link collection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://oniceh.ru/uplcv?utm_term=free+fire+advanced+server+hack+diamond PDF link annotation
    • http://kashima.cc/userfiles/file/95850579815.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/jizesovepa.pdfIn PDF document text
    • http://samtekelektrik.com/files/madutuz.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/12142416098.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/mosufuxubokubenilutevubu.pdfIn PDF document text
    • http://meteoratourismactivities.com/files/files/54572710140.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/pizavakasuxubezojar.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/zinozov.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/zuwukigivoda.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/60095924209.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/57137912399.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/tanizumu.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/57044235579.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fca2bf469---nagametamutidipevur.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/87448387754.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/50861347395.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/34875945443.pdfIn PDF document text
    • https://almavilag.hu/files/files/26321646476.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/87238097909.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16143f9a9eb6a0---13835013569.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/kurepikej.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/zikapadokuvoturutawuxi.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/39131155900.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/jonodexawenawatinaguri.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/34741326442.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f1ad17282ed2f850dd7c3f9f9a424eea/junezigixinidojobo.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_off0000b0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D2 10732 bytes
SHA-256: 881c6fc959d4c21f9f9c4019fd1fba88671d46c716472314b91bfe8dc8e7abc8
font_01_sfnt_off0000c93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93E 15828 bytes
SHA-256: 3fa11ecc0ef8bbe8507ebf26a36fb541c28d2407072a9de8019877856f87d509
font_02_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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