Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da9990ddcd6a8e9…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 20:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 226131a98d627ca003e7246d1ac8acc2 SHA-1: 291810538eee99af6bc23ddfa0de995a0eb3beb2 SHA-256: 1da9990ddcd6a8e9041aebf146960d5b190970e8c14089bcd8fde233b82e3aac
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware download sites. No scripts were extracted, but the structure and embedded URLs point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://semot.com/Store/userfiles/file/82332061557.pdf In PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/tinidekutapidejeretil.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/44172294072.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/27543100639.pdfIn PDF document text
    • http://safarang.com/basefile/files/gesopurabewaxeran.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/zewolokol.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/xedelogavadezezawolexopi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4377071f166e6bf5a629d20944c6ee2c/kawobipujer.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/80007532794.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/wotelepowipu.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/75166014342.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/dusixegenejimu.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/19036958796.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/romizefoz.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/xawilulodu.pdfIn PDF document text
    • https://terracell.pt/images/file/32679968652.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613556a99a22c---16943954366.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/vobuzizuviti.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/94733065755.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417d35620f1---34369868204.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/fupufokomefofa.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/vetujaravanizonulenuwexit.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/vunatamaxodufuraturo.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/baramegakoxedibax.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/92716461447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=modern+combat+4+highly+compressedPDF 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_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 17812 bytes
SHA-256: 73711006677fd41cf532132c7f1e8d13f83b0a46128a79f6bc14daf4b10b85dd
font_01_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 11284 bytes
SHA-256: 283e07508f851112f8b679641da9d2aacee8963fa86d732ce0881c323a74c0fb
font_02_sfnt_off00012cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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