Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b365f9fb942dff…

MALICIOUS

PDF

68.2 KB Created: 2021-10-01 20:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e3ae390d548ece39c1deedeca1a534e SHA-1: 13d4d3ac04054dcaefca357d072693ed31fbfdd6 SHA-256: 81b365f9fb942dff42d369da6566b3f43ab15b70801db0dfa50fa7aae45adcc4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF exhibits characteristics of a phishing lure, including a screenshot-like appearance and numerous links to external websites, some hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://irlanc.ru/uplcv?utm_term=cbse+5th+class+science+textbook PDF link annotation
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f79a3ef77---52522413886.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/12798223346.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/21487175736.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/subixus.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161534df8394f5---maxeba.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/bawusitafegodobebiwatofe.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/zoleji.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/vazebigowixaxu.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/94064407549.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/tupaxufimor.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/91637476015.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/pejaxikotomofevirisel.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/jeduzozoturug.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/kamosoja.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/vuviwumozagiwod.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/52541594753.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/77bf954bd382a08bafcc27b61c311644/kazifiwurawevitadowijuwif.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/debomodixud.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/12204261562.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/vobudujezumeve.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/80062017686.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/dewokosizurijedu.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/lamivub.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_off0000afcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCB 14060 bytes
SHA-256: 88a9e77dd2d89b5a9d86f469a17082b1f9d6957d122341569aac7a239605356e
font_01_sfnt_off0000d25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 10724 bytes
SHA-256: 54f96e1cf0a92eeebea5c0aea45ea4940105aed0002bfd6af246a7334204c039
font_02_sfnt_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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