Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95b8da2333b1e45…

MALICIOUS

PDF

80.2 KB Created: 2021-07-01 14:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c908c417384a81af94fb451eaaa3f7f5 SHA-1: af4a1d45c0ac43693636c6149b061e895adb1c19 SHA-256: c95b8da2333b1e45beb880ad3bf5735cc97a5a11c5986185189f1e13d69040d7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4803

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://smidgel.ru/uplcv?utm_term=how+cars+work+tom+newton+pdf+download PDF link annotation
    • https://bodegoncriollo.com/userfiles/file/vumifevemepeb.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/8062o5redhmun3pkt95ke5k2g2/jiteral.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608da7168db07---37398915709.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5b8af73d43c57086fa643f0209e1e70a/41051792781.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfb57ac821---wofikebemuk.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ea6516d4---xarivo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb57854223---55674969060.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd497b9cb5---17343056922.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/pufagexixesilagemarepim.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085f366a323e---zejuj.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/52818549635.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/kasisadabiledu.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/kutasononazemufileja.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/32877b7b902878c3c6e1c19758d7b4ce/88464226027.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebb532d107---mimofuzofexavubebe.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/90217996093.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/satipiganupek.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/a4f3a570ad870b94aedac419b535d440/2255730221.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6c8463dd4b0e14302d1fb882bec5a71e/gijorefejogejas.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d0e1c6912---13008261776.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/928bu04glvknd4hmeidun6rkug/murapebusinu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210610215625929.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_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 16860 bytes
SHA-256: 61ae1077b002e42b054c061114ff278bb7ffe7475d24a4e7ad6aeefb827b0e58
font_01_sfnt_off00011d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9B 10860 bytes
SHA-256: f3a576aedabeadaeb9332322c233ac0a990211bdcbb84e2455e187cb045377b2