Malicious PDF — malware analysis report

Static analysis result for SHA-256 51664cadb1ccd6f4…

MALICIOUS

PDF

84.1 KB Created: 2021-06-13 20:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fdef96b52a73d6e4b9c94a6d903b465b SHA-1: 08229a5a04188e9d69fe941c5ae8bfddfba528cf SHA-256: 51664cadb1ccd6f40ab873569e97f724601ba3921afa2f05b459cfcb55274506
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to compromised CMS upload storage, suggesting it is part of a link farm designed to distribute malicious files. The presence of a 'download button' heuristic further supports the phishing lure. No scripts were extracted, but the overall structure and URL findings indicate a phishing attempt to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=a+to+z+odia+dj+song PDF link annotation
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5ae4b0a78df56deb995213a24d8a0406/wozupifawaxolexe.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/v0njk8p544inept2cj3stcnmh2/mixokogipijavuxanezovifug.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/jonifimureraweropo.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e65be7f0edc58c2922bdcf088834d1ed/lomapiwu.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160824da15c892---bonanuxiguxewusolidutis.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6716e40abf---69748368992.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/a9280918e9c95c51803231dee0832dd2/20968586643.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/tozukavavudukenuwiga.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/gl6d9aaverftrfm23bhj1oh3ca/24230112735.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/30353088724.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/genawuf.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/zabunobun.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/58021631871.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b101a9c6f9affd76c42cfe658bec7988/89581926876.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/5hnjnrjkskm4g0s9k592t24dvm/83626906272.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 4980 bytes
SHA-256: 402ca5919709e8076e76c485bff22ad85a822b8436eeb3942cd665c5fa68a45b
font_01_sfnt_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 10608 bytes
SHA-256: a82804071be4da4a94c0388e5363191fe06e98ae7b3ea22869f8c9116bf68814
font_03_sfnt_off00011cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 11416 bytes
SHA-256: 836ff318d21d0bcf4d1e349cfbba5ac45ca6ad754679a1935e792764ecf0fb37

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