Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a7b6bac8fd5b0e…

MALICIOUS

PDF

93.2 KB Created: 2021-08-04 12:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3da049361dac6cc6d21817fb5f3d035 SHA-1: d90c83fd80a58bc6f43fe51b6851cbb372b25d7a SHA-256: 53a7b6bac8fd5b0e87aa05d95d44c30b55182ec1ccb2f5ddfb77537fe68bcbd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, pointing to multiple potentially compromised CMS upload locations and disposable hosting sites. While no scripts were extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/zefililopaza.pdf In PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bd6debc64---pawinotijuz.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0fa05349c---6198984994.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/52511047007.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/pesumu.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/bizexupumita.pdfIn PDF document text
    • https://fallsplat.se/file/25442112633.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a18284f1f08---57520342230.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/gulipo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5799c16f49---30523994376.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160faf04251462---32588758092.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/56617040637.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e725f9eb3d---suzivewela.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/46053426300.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/68283927566.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/pigemafunigala.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/bf7c29b28b6aaaaa257050191e9abdf5/17401513771.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/54343954614.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/51e0a1c99509449063461650caa94c06/pulagapub.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/q4op3duf0jr3a5mhr23ijm9m11/27691067535.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/33733129189.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/zojosopujagupiwusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+remove+cement+washing+machinePDF 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_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 17296 bytes
SHA-256: ce519143ed313773b142f1e0ee7993e0fb32f302c7bdc4392763280444dadbad
font_01_sfnt_off0001356c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356C 10772 bytes
SHA-256: cd02b5c0b97e3450e84cf2ea693992c467c2594f6297048fc92a61011561699b
font_02_sfnt_off00014e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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