Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84b07362457b03a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 15:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d055f4fa896c2f9f6d33abba1cc99560 SHA-1: 09edd0fd91f6c2df9e2ea4dd15ca259898c2776a SHA-256: f84b07362457b03a677046595e0f8708e98d5ea3d1a0d83d4b723f3b7110d955
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=mobile+game+with+the+best+graphics PDF link annotation
    • http://jjw-led.com/userfiles/file/48061761695.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/28326527105.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/retulu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/28075644445.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/90410545486.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152eaee99950---vopidopupowaved.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/3is6uuc3tcaebhmp4g910rbca2/sosobasudojapixevim.pdfIn PDF document text
    • https://novitas.ro/files/zoxofuralovenopogikes.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210905121724.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/79991145684.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/jirox.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/42565195794.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/66717131397.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16148c41991181---zixoxeveziped.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/javale.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/diwunuzijawimekoginen.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/59119630782.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/bugaxajuvozadanowi.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/57325147494.pdfIn PDF document text
    • http://meditopthailand.com/file/22579795829.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/bigopezinemomeganenux.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca21099427---virotujorog.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_off0000af42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC759 10936 bytes
SHA-256: 6e8dc41a29aaa25582416ed2bdb89423243a5820b6125dc03ed1da7cac95e6b4
font_02_sfnt_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 16144 bytes
SHA-256: 085a5df989cc40ab2acaf6a32350ac179a2db0e3d43c8e78728bd7f1f1448551