Malicious PDF — malware analysis report

Static analysis result for SHA-256 8630e4f63d42bfb3…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 16:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e3caabe38e63c14e7b3c7e792efa3f5 SHA-1: c7e9f2b8b75bfac66cc7c52bd81a447d682950ca SHA-256: 8630e4f63d42bfb37a90e30abecd110072e49353db8824ebfe0c264250858041
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synphabase.ch/upload/file/zuzuwewoxom.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613925dc75d01---nijoverurifarimopu.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/topozatiwebituvolowinidu.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/40759531590.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/68528707158.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/71961423996.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/99854919143.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/82021217012.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa43abc26---jalevudidumaberedasorog.pdfIn PDF document text
    • http://snsi.jp/image/news_file/sazimovo.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/kudakejefagiweg.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/faf645a8c7a50220e63d1d6d0ee738cd/xejepakasugeketa.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/64743957957.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/39853200504.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/79202727926.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/kifosatitefogixitopunot.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/7312393702.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/10801810057.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96e9a6546---zovojajosidudivulupir.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/98212970738.pdfIn PDF document text
    • http://freeorden.com/media/file/jekenudanipi.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614234ab6e42d---44267055907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=watch+english+tv+series+online+freePDF 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_off0000d0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 17156 bytes
SHA-256: e0c07230c9293cb9cd016025fd8d031d80446c54ca15bab05d93d5a28208d844
font_02_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 10672 bytes
SHA-256: 975745b7def4ee9a4cffe031bdda08cee2f1d419ea9d9445cb03c26faab40b6f

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