Malicious PDF — malware analysis report

Static analysis result for SHA-256 795e53d73f81d0a7…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 16:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b46d0e4ce62ff54676b3d285fcdf1c29 SHA-1: a1274cc53e21073e8392818da76b410ed4f351c9 SHA-256: 795e53d73f81d0a7202f4bcef76e61df1bf7dabdcea72ab3560b06d4a6767671
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further compromise. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/bd9217072355698154d680cd44b16719/zefebiwigusugumifakejipor.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d909aceb7f6---zududobananosokifuriv.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/fovatugunelulog.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/21904600301.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074c82ad4426---pomudilujipalo.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210826104517.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/da6711bdd7ce5afee277e0dc405ab5ca/91001448845.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6da6a4678ec24c39aff1c432e3e7c9b6/67575079619.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/sawalobo.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/lejuzu.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/sofasevozonugasesadalifer.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/b27gtdvghdgqden0hd6dnbm2ur/bopan.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/39634546253.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607701ab2739b---62641657591.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/kedotatimebabiv.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/wofafugajug.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8578be9207---52199116882.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/foniwiku.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/10231565692.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16087d78b42316---gejew.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6aca2208e---62041588558.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/kilew.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/115909188360b3fd4dcc8de.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/77690396471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=a+diminished+guitarPDF 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_off0000dbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB2 10608 bytes
SHA-256: 698f8f10ca6461adcb9789026fb134f3eba04788e7d37d075f202119934233ff
font_01_sfnt_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 17596 bytes
SHA-256: b027089f5207c67ace78d9e5f4441beb796868e88ba1b33a92633a57a676de8e
font_02_sfnt_off0001211a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1