Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28e752051281e91…

MALICIOUS

PDF

97.2 KB Created: 2021-09-01 11:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3d74ba8e7cf46d42714dfdb88f5d310 SHA-1: ce321f63bcf123bf8eb28618604756e89a75f7f4 SHA-256: a28e752051281e910e132126bb772568922d57eca39b2e3c5d5f0b7236b3a412
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://anvlaw.com/userfiles/file/91156143927.pdf In PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2f7679631ad52389708257a79ae87c60/1646251481.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b6e7d7d01d33c1dc7f5ccdadee6599ed/90264262165.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/42610942489.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad6d125b6---60809767543.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e9d015064---61456023998.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/75106327059.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3bf38436b---wudatoj.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/smts9jegueevrdgfejkd0s29g8/jepetu.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/lakotizasanani.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/47696172389.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/18299514321.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/zakaf.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/pinuvikanix.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743703f413f---pogifuzegujotimoxan.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/cda8dfa7d0457de7a9ae97b2ae0e0af4/89058200492.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/95763621134.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/05f8a3fc23ba4d3d64a0d4cb62dde25c/16741833748.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/1b7f3685d1dad9e70a34a98550c6861d/kazilekixasuraba.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/512320353.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2e8b94755---xukagasexepadufupuroxe.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/nabazekowuririreperodeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=resident+evil+4+wii+edition+isoPDF 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_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13054 10256 bytes
SHA-256: 7d4cf11d360952ace3ff929126fa8e8fe533e45520f43c8658854e6c9d0ca810
font_02_sfnt_off00014793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14793 18016 bytes
SHA-256: c0c68fcff8c675c28551bedf401a38bd806a9dea68fa10dd22f95f54f8112387

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