Malicious PDF — malware analysis report

Static analysis result for SHA-256 9178c7673780dd0f…

MALICIOUS

PDF

86.9 KB Created: 2021-06-30 18:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1e100e40593b808b70f6b946559f21ca SHA-1: 6f6a88eae7f237e2dc7e5565c3df0e8f5a310d7f SHA-256: 9178c7673780dd0fd03872f49beedf1564a2b6a1909c3c044ad3bb0515d09116
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be malformed, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://tokyoto.pl/UserFiles/file/87674719511.pdf In PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/d9g1plin12moqshv1lfkj0tfqu/bijisomasejuzusukizenifi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089142ef109f---gipotitogejiperu.pdfIn PDF document text
    • http://askort.pl/Upload/file/bejuf.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0f183a813d1db95348dcb3ac88acf24e/5495341716.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/fafovinuwen.pdfIn PDF document text
    • http://nfc.soo.jp/file/xakozurawulerosunoku.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/9640fd28b91880dd02fa9ab8174aa27f/75341101035.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0a01df81d28085fb6bab6fe6ac48de9d/10507603009.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fivebofakuz.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/8493540ccb192baa6c0d71101aa3fe9e/44889506237.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/62568640204.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2ead5b01---timisinusaboli.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mr178ive24pfi22vnqn7dfhqn7/79001551954.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/46710870686.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c5d397e3---43335329729.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826df3f1523---sorevopimoniva.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/32050753504.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qm3qdlpv8p0l7uauqpmpvn5knc/91974508344.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99b63f40d9---19189204211.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/wadomalixa.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/45163216477.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/wimazuvuwuf.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d297a19f8---nudodorezefidofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=accurate+5744+load+dataPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 18268 bytes
SHA-256: eb29d28bbf11b70b40b447dd49f57a0dca7fde2b24d3e94de0764852d177762e
font_01_sfnt_off00011eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 10340 bytes
SHA-256: 386d29705a4c11b4f5370ecdeecbc702ceee6c7f63972b3f2a34fdebc0956c40
font_02_sfnt_off00013695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1