Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ad044fa8b07a10…

MALICIOUS

PDF

81.1 KB Created: 2021-08-18 22:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cb10890d70879e0b5d6b4c8a65aa3351 SHA-1: ae58e6d58f7e7e8251f5dac963bed7c1c4e2f744 SHA-256: 05ad044fa8b07a105a33bb41fea9a18c226a254510594c336655bc836d0039da
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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=why+straumann+implants PDF link annotation
    • https://magnettoptan.com/upload/ckfinder/files/67917151887.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/if6tr858k9vmkvf3dr3t245h3o/limenafotumizoworuzedajuk.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b137a414314---62545981968.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/xikeketekelubisuxuw.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/buxewajurotigom.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab323405fdf---46944819585.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/627334a29547ce7c442cee4b11a0b337/20230126554.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d23d1efd9---90761523859.pdfIn PDF document text
    • http://jinyezi.cn/upload/34662162330.pdfIn PDF document text
    • https://aromamarketing.md/img/files/kosixofavilijuveto.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/1818081042.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/godedufarixunotobavoreg.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/79403634017.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/21569842145.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52b547300---nabekepupi.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/xikegawij.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/sebajozi.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/63726895819.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/tolij.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/66852932667.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160961f1063ad9---48223199316.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/viselofe.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_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 10472 bytes
SHA-256: b36c4b9284b18cc5c5261cde55b5af0a19775c90c1bac5c0d33d7de5fc5e96fc
font_01_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 16240 bytes
SHA-256: 38f95a7ee94bbcd37a0a5aad08fb0d992f123b31540deee2d1fc1769d0416d69
font_02_sfnt_off00011d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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