Malicious PDF — malware analysis report

Static analysis result for SHA-256 588219b5a08f0465…

MALICIOUS

PDF

68.4 KB Created: 2021-09-04 09:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 91d4943e789f20568dfc082e266b5748 SHA-1: 95af27e19c3a7aa2543e01865de4919512fc2dd4 SHA-256: 588219b5a08f04653bd09a0eb736c2e150e4160fa6714fb04c9578f42a6827d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via the embedded URLs.

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 http://thunderstar.cn/userfiles/file/20210708044632584135853.pdf In PDF document text
    • http://sbcnepal.com/images/file/56540324592.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pjhelndkrut0h4jc8ennjv7os7/witurupinakux.pdfIn PDF document text
    • http://elm3rad.com/file/fumatofo.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/6361497030.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/pukukeduvaretajatibizal.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c93081e4d8---72239836282.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/nutabalosukiv.pdfIn PDF document text
    • http://jljemc.com/upload/files/ruwuvelupopalabusalogox.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/65728715979.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/99338516320.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/dezek.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/dajiz.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/tofanupufufojoxureda.pdfIn PDF document text
    • http://remobudostol.pl/pliki/laselir.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/papidatolexewurebonaw.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd87964422---raxuvizesosureve.pdfIn PDF document text
    • https://wasael.com/userfiles/file/52971073904.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/vejivomexowoxazononufup.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/vituragaxabomazux.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/56441681299.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/96425889450.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ce70dc2a---fixomusepifo.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/jebuvafomujuroxozarut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=daniel+dennett+books+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_off0000b081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB081 14368 bytes
SHA-256: e4e2a4095825aafff704e8ced9e7b277134ea4dee9df5296b58df9714e20a6fd
font_01_sfnt_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 10624 bytes
SHA-256: 172a2be4ffbaf3b90a10c0e27e9194f6ac326632e62116ec149a2360464e2cf0