Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d74b33d34f215fb…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 21:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 06b7b63bad496b887cf058f0f4684197 SHA-1: f5897098238ef871aa049f072819d67fd605e827 SHA-256: 9d74b33d34f215fb0491669cfcd9c8878d67f51e9941b88401cd278b936345b0
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://herfection.herfection.tw/upload/ckfinder_temp/files/20210907011128.pdf In PDF document text
    • http://flygarfield.net/userfiles/file/sagezixerilegubiwam.pdfIn PDF document text
    • http://vina2002.com/uploads/files/jawav.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613def2f554be---29653434422.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/a2d1bqqoeh2bufdqdm9d1ao15v/zizoxilidi.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/57049068192.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/regovunutuwep.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/14351094770.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/jepil.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/1649070314.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d029078a996a7ae70d31ffb15440460a/73422848987.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/movowasaboradasomev.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/kebakebite.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/zovudopuwifofuwuneviw.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/64768554771.pdfIn PDF document text
    • http://tabletopad.com/images/file/7499219315.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/21776596749.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/padipanidebitufemorerem.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/7779005911.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/26776465754.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/wafivamedinepuraj.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/vekasemadatazigezove.pdfIn PDF document text
    • https://norservis.info/files/files/72762202324.pdfIn PDF document text
    • http://kammed.com/userfiles/file/53809248959.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/lexat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=a+quiet+place+watch+online+for+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_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 19080 bytes
SHA-256: a365f6c39c63927d4e75d95772aa79a3d887fa23e6acee4f7efc3ded3935b14e
font_01_sfnt_off0001183a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183A 10724 bytes
SHA-256: f3cdebd1266ed7449e03fcdef60e9dc61759b7c391c0d3e3f9c0749ee11d4774
font_02_sfnt_off000130e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1