Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f24ee2718bd9f8c…

MALICIOUS

PDF

84.9 KB Created: 2021-06-30 20:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ac196b25d1c21fa19c4f5422a3cb54e SHA-1: 95edae839a4970360cf73b3cdef9aa941fe9d0a8 SHA-256: 1f24ee2718bd9f8c28ea6524e61e5f951ca428cdd80d737dca4dc104cdf21f33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing operations. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://micronforgacsolo.hu/UserFiles/file/garoxejajimitajabas.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf163cb66c---rajaropa.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/5427625562.pdfIn PDF document text
    • https://luminex.pl/upload/file/lusezatusonekoviru.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a3db27844---vulepukidimanijezade.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/vesaw.pdfIn PDF document text
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/zetuxa.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ce5fcc3e7---77305138869.pdfIn PDF document text
    • https://energooptima.hu/upload/File/9477425438.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/fetupifibin.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/bojob.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/roregubavidemefemigomobuj.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/34327285495.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ihh9r15tlohgdmphoe5crkpgdm/pebefowesavonowan.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1974bd9a41---48158397308.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/1eaf76d34642f3f7df08d48d46d8b4cc/55376642938.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/demubu.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/88612060784.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/vmh4f82khojpjgf5a9637i961s/56662987102.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/25117131885.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/godegorepapodenabixufe.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa91ba3630---33580847525.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608462dc62e65---guterirotobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=dungeness+crab+chinesePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC46 2924 bytes
SHA-256: 0948b32ec3e097c2e92c0a3ee0c44db9bb6dce283b4752c02b14833af22cce9e
font_01_sfnt_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 17576 bytes
SHA-256: e1632e3963f7e290d233baf647ece9dfdd84f1b144e1230075ef28e1da07f8c5
font_02_sfnt_off000115f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F8 10488 bytes
SHA-256: 131f45b316766e9d52e5d40eaed89a0db42b1a0171b220740055867447fa64e3
font_03_sfnt_off00012dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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