Malicious PDF — malware analysis report

Static analysis result for SHA-256 487528ea4c93ddbf…

MALICIOUS

PDF

62.3 KB Created: 2021-09-18 04:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: af4cbc4e0e11bd4f9fe7fffd043d8f50 SHA-1: c07212052d837c66b358642554b7ed778517d74a SHA-256: 487528ea4c93ddbfebd1c695f4da74a0ec652017bc6a22557a03fac7f1d485a9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links indicate a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5428

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=download+force+lte+only PDF link annotation
    • http://stagelight.pl/userfiles/files/lejifirobalavawason.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366bbaa9f03---megedalusazobewiwana.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/rigizazosapupari.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/43448275374.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/banig.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/mimuxevadize.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/pafasax.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/verufokuxipupoladexebareg.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132e1ea2c291---lineriwemufidin.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/sanadawaveguzol.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/nipobojojomaditunurira.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/sarevuzukubimabikuderu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614229ff34c32---41043697881.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/29011687922.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134e27f78cb8---vimax.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/fegilufisaxizepadomakale.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/ramukakej.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/voxilanoboridafaxorijebi.pdfIn PDF document text
    • http://sinostandards.net/upload/files/53468377013.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/76415142375.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/jagunidu.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/15291036768.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/dumil.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/nogoxalebu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EE 16980 bytes
SHA-256: 305c54f3dd5b0835ddd27972ba73e3a93244aef462414bd20da482d32910287f
font_01_sfnt_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 10408 bytes
SHA-256: d52db5505496c716990e141de45f00f8201b74f6b8879fda76cc8c0b8c1cecb5

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