Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04ca05fcdde3a66…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 04:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93fab86a5aabc6331a4e4830d340f722 SHA-1: 66f27e971a0310e7ee4e385532eb195e42719a05 SHA-256: e04ca05fcdde3a66dd98f67731fbad08c2a8b9280cea231dbf2b417d95ac3cde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=happy+kirk+franklin+lyrics PDF link annotation
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1c711ae77---wakimeforexatelusoviwaf.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/24373722850.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/pitoguweb.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/dijojevoxoweni.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/kolovimujutuxifuvomodo.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/16423013350.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/mepomasijokixezitogonawe.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/58979b29f7bc37ac60c20032702a6a3d/91953040639.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/88231952249.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/40818726064.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/ruwipunubebafomokujew.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144938b4e0ef---10043335214.pdfIn PDF document text
    • http://standdominica.org/files/files/41460294259.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/74898235674.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/wifutuzoxu.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/perilevuko.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/24898131242.pdfIn PDF document text
    • http://nenorm.com/files/files/50357540182.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/tupoxowaluxovijedelabip.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/bojili.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/tijegojexivofebufa.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/piluteku.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/80521756110.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa21d27932---felejovizo.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/9685988867.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_off0000b520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB520 10320 bytes
SHA-256: 6ef57f1126bc78cf7de96c47348435c38d3f52fa124c2c91b60c775752c2dfad
font_01_sfnt_off0000cc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 14756 bytes
SHA-256: 73fd202bde6ac769518f3165398448065cb87c4673c6821d2a5e0d8914291a6f

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