Malicious PDF — malware analysis report

Static analysis result for SHA-256 808045397777b431…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 18:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac7cff01d3882ac5f403812302f7f594 SHA-1: 5566550bd80238363ca4e2242e47a7b95eeab12b SHA-256: 808045397777b431bccbff4986fbd7b5f34b6d6f11db335b50329f0bc3ac7c4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://laborke.ru/uplcv?utm_term=250g+to+oz PDF link annotation
    • http://humanitool.ru/userfiles/file/97414165858.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/69512711641.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a811c18e16e---saserol.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f095c7b3a---xukoxogiva.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/98155955556.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/sepurizilenogutivaxilew.pdfIn PDF document text
    • http://jarosi.hu/files/file/relitovojutulajeraxemewep.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/95047963633.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/92482288021.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/temese.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc3d82d98---28579170863.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/a105c417e397452cec5d102877bbc1da/ragupawekizipeju.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/94932261793.pdfIn PDF document text
    • http://plncse.hu/php_data/file/34844853460.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/biuebos7e8johfle6497jp8mk7/14180786871.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/dolujavoro.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/33476137705.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/29d8e74ae6febf48369b6d1bfe00a01d/wexoxuloxof.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/92517102275.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/xakanajelelazuxitevif.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/donewebasa.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/zumununatuvifumikekufe.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/jufibemovivi.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_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 9816 bytes
SHA-256: e67ea17aa009e3073769e681986ee6a262a207be8caabc27f5fe3acba6654998
font_02_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 18640 bytes
SHA-256: 443e422c13df3a9b36a41d0172cf45e303ebf105a159169837646c912dba7892

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