Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa951bf499f34f65…

MALICIOUS

PDF

54.6 KB Created: 2021-09-19 06:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a257d5f89e307f1de9e479fc9e213c7 SHA-1: 405f7369d509ee69d735be4c9a89176efeaae1dc SHA-256: aa951bf499f34f65b2c628b6e57b02c2c7131a26693d1d3613409a3ca102d378
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or downloader attack pattern, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8350

Heuristics 5

  • 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
  • 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://garglob.ru/uplcv?utm_term=download+game+blossom+blast+saga PDF link annotation
    • http://eros-arena.de/eros/userfiles/file/guxijaxuxovavak.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/85453577392.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/subepesededi.pdfIn PDF document text
    • https://31app.com/userfiles/file/2937965983.pdfIn PDF document text
    • http://mrybalko.ru/files/bexegunejufuledavi.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/lodubuxovukowatapibudoj.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/xufadenevibonevepomela.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/59993899141.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/49736642119.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/buwaxetu.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091516115173499.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/defojodedaguriwujade.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/satenexodejeraposinulibew.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/koliwofivejuw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1942b681---23393493781.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131797e099b4---3997453102.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/94359219878.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/balapebutukoxowulisadup.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/rawatizesidotugawe.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/netisudujabekisesaxijovaw.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/53434586811.pdfIn PDF document text
    • https://fishboat.hr/files/donuzelezajata.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/85584825618.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210912165356.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161381e1d63465---55417236146.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E8 10624 bytes
SHA-256: 2ddb804206d3ed11f29ad920da488db4b55a1d38e78ede6b8e217d984100d189

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