Malicious PDF — malware analysis report

Static analysis result for SHA-256 b892e05f5bbbd16a…

MALICIOUS

PDF

67.8 KB Created: 2021-09-01 23:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 532d2fcaf0641be9a0148b5f1a0b2fb9 SHA-1: c643616bb4ed89c915428de585f700cc27e4ccb5 SHA-256: b892e05f5bbbd16ade17ec0d5ffc724867b708861800ff63daa3a2162b79389d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the ML classifier's output further support its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7825

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://garglob.ru/uplcv?utm_term=star+wars+angry+birds+2+apk PDF link annotation
    • http://verypool.cn/images/upload/File/60498196281.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/55212866951.pdfIn PDF document text
    • http://w-mill.jp/images/file/nivinajexugagatogaw.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1904b3aae1---solotaxudo.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/xokotemikobebufa.pdfIn PDF document text
    • https://tonitomov.com/picture/file/forekutivu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/37031eeb51fa954c8a8823fa93610bea/21047705894.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/siviposigimebuxed.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/31212827706.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/moxorupaponegawakalefumiz.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acb3c90b2d6---nexawabuwadiresemuvu.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/57968373875.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081b318b68f8---gosepuzidamit.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160879ec90455e---zojomaworujigisekijabuna.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/83143452726.pdfIn PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/48829063848.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/tekebuvelaja.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b2228cf3e9b226bd9af10c49ca41cab8/46514252040.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4beac394ff---35196772204.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/33642980134.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/7159340508.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/jelejakenuwaguziwoparuja.pdfIn 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_off0000b630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB630 17376 bytes
SHA-256: 441478e9b9209e0eb26cd87062585f67c1ad091daaeda525c0e32a7e86d6cc6a
font_01_sfnt_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 10896 bytes
SHA-256: 1e5443f07d107ef652a16cd5f5923a74a6dc0d5f9ecb3b74e3162d84a75d33f3
font_02_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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