Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c9baed7f8e9548…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 01:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 720cdebc98dbdcdc36780847c48bd08c SHA-1: 91e47dbb41367f27ffd73dc34e2c0a479cc1ded6 SHA-256: e9c9baed7f8e9548bf03d05fd73db7cd948e2608fdb965ed61e3ebd2f80006b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically related to phishing. The document body is heavily obfuscated and unreadable, providing no direct user-facing 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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1428a399---weput.pdf In PDF document text
    • http://feach.ie/images/uploads/file/54744674251.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/vosajakenepovem.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161422691bc7da---21728235555.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210926_174632.pdfIn PDF document text
    • https://cityface.cz/res/file/73037196144.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/15841295347.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/58292879418.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/188113d32b0f42f13685b94441011219/kazisakenen.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480800f0fbd---63065600763.pdfIn PDF document text
    • http://mebco.ru/images/file/rojifasezofomizipomagudu.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/menesunip.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/bafigerisujuno.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/82045140912.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/52224605936.pdfIn PDF document text
    • http://texmet.pl/userimages/file/71156579649.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/wexepirulopulokafog.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/jupufafod.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a4a4adac28cdda63ee94002f7d6a00ef/rovajepeba.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/21186404517.pdfIn PDF document text
    • https://alariel.be/userfiles/file/zanuzigeberumabozizu.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/fowuj.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/gosugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+writing+app+for+tabletPDF 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_off0000b121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB121 10812 bytes
SHA-256: 4cc5a16367b8846934c3212fcd11d155b4bb6e1965a7332ec66543d8e1b38a3e
font_01_sfnt_off0000ca0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0D 14616 bytes
SHA-256: a5a4e93536348504325e851cf842948578a86a485aae4c2edd19bdda026a0d9c
font_02_sfnt_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1