Malicious PDF — malware analysis report

Static analysis result for SHA-256 573c7fcdae2a5d90…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 23:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5bae9358b8fa852589304ff15af7583a SHA-1: 41834fbafc3259e7649f0f2540425cc94d398cc8 SHA-256: 573c7fcdae2a5d90ca4ca2a279fd2b15b0bdee2413fe4ed0cfa57f9c05b4b69b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://klimatyzacjaradom.pl/userfiles/file/63817688341.pdf In PDF document text
    • http://odumakus.com/uploads/files/xufone.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/41196434092.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/volixuliseboxorip.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/24/file/1071374946.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa85b39ff6---58909830711.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/bifoxalome.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/12592398263.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088ba6e674a0---16248718394.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/74889096102.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///naxajoto.pdfIn PDF document text
    • http://liyangah.com/Upload/file/nubarumaweredepazasu.pdfIn PDF document text
    • http://standdominica.org/files/files/28786310020.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/netebum.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/007e2f8babb773d4fbfef1d2f493ac39/fobinikinudexi.pdfIn PDF document text
    • http://fxmeat.com/upload/file/e7e95b47e405bdb3f712e33c8496255f.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1ua09u1m9raktldmeb3vjd3do3/34462960584.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/karujetowufiserevojodid.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074d305a9494---larilujuziku.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/18975512889.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/sofudifezeso.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/ziberazezenafubuzola.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/gabezapiz.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/tivazodinox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=human+skills+in+managementPDF 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_off0000c4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FB 10416 bytes
SHA-256: 9f2c2f13c4e94c767cdfbb566fd2b41fa016b85c67af23ee656151e745ffb1e4
font_01_sfnt_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 15772 bytes
SHA-256: dd43f0a24fdb49cb7af3c83248e6c7c338242c2056ef5c18886d9b97359ccc42
font_02_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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