Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cd7cf6e4721be1…

MALICIOUS

PDF

73.3 KB Created: 2021-07-07 01:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 55d2993ef5c41642b30c9ccf9b536afe SHA-1: 5170755b52874344f10878ffad76040affb82246 SHA-256: 63cd7cf6e4721be1e7c3dd4f984a36aa5d34f6b41e5d86aa95e10483b5fbef1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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
  • 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 https://nomylo.ru/uplcv?utm_term=constitutional+law+of+india+by+jn+pandey+pdf PDF link annotation
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608de827ac8df---51764219218.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/o1fpgungqiledaprq724c9j5g4/59091910720.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/80055354463.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3comd58kilhshscmh9eigp1hu6/44282524086.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ca52bd8b9d48faebc59149f8d936676d/12900629825.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c07e07eb2d9---44885818553.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/butumo.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/volujuwipelome.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f30c7c61c---muvuwanerula.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b631aa8d1ec40c717d1221ec042c67cb/newapuja.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/pofese.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/497ea2f39e7403b32a8b179a6efe487d/pevapabaponemiwu.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8a2767460---90776629996.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/sobumaxurasinotiligutu.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/64aab58fbe6ac5daabbba27092b7f945/97002573029.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8cdff897841f9da8f5b15141cdf3997c/2481500881.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210621191757.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e69d5b149f5e7dd2909e408dca7cc63/warole.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/o3di9vdhpc1klqha7ls1s9833c/vabidagogi.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/60372609489.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/80321016380.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/iu1tr765sgigg133k692agk8ke/zofexolegalusunejared.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210604091828425.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/fikerupudowago.pdfIn PDF document text
    • 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_off0000bb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38F 15872 bytes
SHA-256: a87154acf3b01f9bcce254405d1f93054c3e00f897c2ad7bfb5b7d04286b9bc8
font_02_sfnt_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 10992 bytes
SHA-256: 1120658f1344aa6800c60f694be49cb52ee242a6f62cda179414973880c3bd05

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