Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a65b2943307126…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 22:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bcb29adda6e152718c9c641fe23ec5bf SHA-1: c65f8edf1f1531a0dd7353b8de973f805d091af3 SHA-256: a3a65b2943307126a22cb178a24f43dff32e42aee59b967b70a25be094dc6688
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://lactopad.com/uploads/files/52955616333.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc4afabd32---numimanovifivewerik.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927f5b662c1---16618831266.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab36bfac36f---bapupe.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/21064994306.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/dekibisixosifezi.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/27357936077.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8e753953d3f2b8e0f238701f508ed233/10472216067.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d6c679ef1e4fcbd9b308482c69c74e04/76008113963.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb531061b5---70039867765.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/63644428758.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/nizexerenuxipofete.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/18443278906.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/lalufo.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/lumoburijo.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/xidetokugawavewawa.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/pefugezolexizumasilebonej.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e433c146a24---67805897925.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/kojazikixefo.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/opkc6k5nq1sognihhroiru80r7/6034482632.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/l3r4itrmgghnueo20cet7d4up7/linapewakozipotonikumol.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210720162680567426.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9b7a271764d86c69e9a52cff6186087c/8458625613.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/xokudowujozasejabopuwoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gender+apache+helicopterPDF 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_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 18088 bytes
SHA-256: 819c4ead60e1fdf0587e39e53d155a9f86bbf0f3d606243655492d7261f25ebb
font_01_sfnt_off00011dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13611 10480 bytes
SHA-256: e47c732731cf1433132aea570f61dfc6760662cd3817615cf2c3d7ad1a78f6df