Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1b58aff48cd52f…

MALICIOUS

PDF

91.9 KB Created: 2021-09-07 09:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a83ffaf922e44b8c3a41801a5dcb760b SHA-1: 093093dfe20800d04badc2e380a18ec69cb2ed98 SHA-256: 5d1b58aff48cd52f112ce597a6392a5df944a3b1ced214d10e736ff6add085c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pima-alarms.net/slicice/file/jugajopudabujuwiviworure.pdf In PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/fukix.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/862cc37a6d40a141da20e23a303b9a3d/munenafebil.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/94133278275.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a154277c0c---jetubi.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2a8d911889e4c47166547842fc8b4b81/82743684086.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/70869223936.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/68787459069.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/effd94ab68b92568aadf4807c11ee48b/pizokulomigurasagaradejel.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/51097316888.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1405182fb---15134696920.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/22066416489.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cafb9f08d8---tivetiduzigapi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c468c792d24---xisiwex.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/nifafoxamibuna.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0d83bce6a---23551938424.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f8a7c1bbffa---sugupabuv.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2e13eb7dd0e68c99752b66457811aed3/75617420615.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb28ebf20d1---21645169532.pdfIn PDF document text
    • http://cochu.net/resimler/files/91692891961.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e952216465f---17183648423.pdfIn PDF document text
    • http://th-hl.com///upload/files/58021412977.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/12238097413.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/10427067257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=full+wave+rectifier+report+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_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11912 18644 bytes
SHA-256: acec108792a92676ec2dc8bb4e31d3b120f06bdbdc72f3403bcf0b5b98741572
font_02_sfnt_off000149c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C8 10568 bytes
SHA-256: 89d488dd5a0db52a355238c25708b1cb8d69a19ff8633aed28f242d0ecc28e35