Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e6d790d3ecba6c…

MALICIOUS

PDF

85.9 KB Created: 2021-07-31 19:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a36c0cb9c22b56765f8d50a2e29ee30b SHA-1: e028bad9fb6a2e5dd200aedd73a496c3eb634452 SHA-256: 28e6d790d3ecba6c913ca951774a3dc3d33286f0a676d209ad6d97f71c7d9ecf
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. ClamAV identified this as a phishing trojan. The embedded links suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3253

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://crysiq.ru/uplcv?utm_term=everstart+plus+battery+charger+and+maintainer+40a PDF link annotation
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/aqp816eak465o7pf9pq1kedpav/buvitu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a74a48e4aa821c06a3381df87dc8ba20/tetisomumatezan.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/30607167661.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/vuzuvatipaf.pdfIn PDF document text
    • https://petek.biz/resimler/files/bemudugewipamiwelijorunez.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/rozaxidamagafagezofonut.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/nutabi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609df3b406156---98763430737.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b439e2a0---36281012683.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/26ac4a8c3f8184889b1fd1d05469e874/zufemasikebes.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f3851a5887b---52954165926.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3bebf33634ca75179105537de82714a0/fowejuzapazaxalovidilin.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/83634205087.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a70c1307---2152005437.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/a5ad5294331c715de72441bd0856969a/59799256017.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/jewixageva.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076a3e37af54---nabiwizata.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/25841392512.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/sodosoki.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/9h175tata7h3jf44262gt64mhc/83606236540.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/zoxanisesuzibuv.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/bbfe9f0f72b7d9f97b4b53f0191536b5/valomavupamibelagigexuzek.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160848a56d3b5f---minepudorutimotawolirebu.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/81203525230.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c84bb5d3---mazezimujot.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_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 18400 bytes
SHA-256: cbc05c9ad3b1eeb9e352f70da4dfdc69d59b00ada2b5455afe62a7be0c70968f
font_01_sfnt_off00012b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1