Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9ee42330b9a4c1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 21:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8a98741dbe5b1a27f87e0e7bb072635 SHA-1: 8790289807c2d59b075c6d614cecdbce688f4680 SHA-256: 7f9ee42330b9a4c1decef3a8d204eb932513ea39b4137ab315de8a6fed773507
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a lure, directing users to a series of links hosted on compromised WordPress sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://beldapin.com/calisma2/files/uploads/85753714026.pdf In PDF document text
    • http://888spirits.com/userfiles/file/lekometiripora.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c89b5a6f7---12132464499.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/4783194026.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/9m52a0po97befbrkc8c0a5jn6q/xokenejozedujisinafezuw.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f45df11a361bb5e7ccc7643f85d86dde/fofulajovepozuwaleti.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607980d898084---345117538.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/5l83kkbrnte4e41vqltj3g49a3/20457257758.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4c96a250---ruruzisos.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/zabaxubogumuv.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/80100454078.pdfIn PDF document text
    • http://bjjiffy.com/upload/75853760461.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/ragifawukadidina.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/1765082493.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/gapti4uhh5cbg4nscuikbgfg0l/kiwonojajixuwabinizijan.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/36400681475.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16107f97c601d8---78888336704.pdfIn PDF document text
    • https://dragulf.no/files/file/zujilaf.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7b842c80324690527eda54702ab3d1d/radizexani.pdfIn PDF document text
    • http://cristalensi.com/public/File/bolojijetawolonimitos.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/29242923280.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d11dc1bc9---jiwigoropaboba.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ge4mfifuq5n1ju3n0539g6j8g5/xeketone.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127701696a5b---22936926769.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/27c7cd263be8f37f2748ed39ed939c69/golejaneponanusik.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/80270883138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cara+compress+pdf+500kbPDF 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_off0000d3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FC 17112 bytes
SHA-256: e21bcbe87e9b8fe7538ee7e6043c327a686c944dc84b943fe4f42cbca0d6b463
font_01_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D7 10960 bytes
SHA-256: e251c9ec72a8641fa40ccc4bae987faba081939a1d920bf50180f9763379af9c

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