Malicious PDF — malware analysis report

Static analysis result for SHA-256 1185a9d13ba0f459…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 21:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db4e8341b6761fbfae121a5d89b7d131 SHA-1: 1524b4555a3b451327f66743a1b9e17854c75f46 SHA-256: 1185a9d13ba0f459cb5d745941a564f073f15f75d73f4db8466c5fde22dcf5e0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with multiple URLs pointing to compromised CMS uploads. Although no scripts were extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403b66089ba---9722896866.pdf In PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/vefuzobisotomipogagorer.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/52972240379.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/sidetujerezezetokela.pdfIn PDF document text
    • http://kustari.net/userfiles/file/6225530413.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/lifixaxilekilu.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/zadusitiwixirokujelenu.pdfIn PDF document text
    • https://badrivishal.com/media/3898169592.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/520608508.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/dasazomi.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/trsdme5krf2gkrqjd8u5s1v4m1/vepakiw.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/nebesetabisa.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/gufunoxexovamefi.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcfbf8bf26---58836728405.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f997b7f99---pitiwuvigixudexuxu.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/86721315071.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/ritisevenazonadim.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144494364f64---41135483307.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/29283513931.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/81152509454.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/26585240137.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/68850650481.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109042311558244.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/2168587348.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/44757061441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=english+comic+book+pdfPDF link annotation
    • 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_off0000e092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE092 17672 bytes
SHA-256: 49605062e185c0d9ce0f82d3050c94d4470f395e5dcf99cbe806f3e5560c6bd9
font_01_sfnt_off00010ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED3 10788 bytes
SHA-256: d6b051408a336dbe3718ef8b6ca687f3a106707bfef5c011b9aaca2b2a2da7cb
font_02_sfnt_off000126eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1