Malicious PDF — malware analysis report

Static analysis result for SHA-256 f044c79b54c9a883…

MALICIOUS

PDF

105.5 KB Created: 2021-07-09 20:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 927e3acb126988275e4603904bed1ab7 SHA-1: b6a76a9fc0a19d7484fca098fc6ae08f0830fa06 SHA-256: f044c79b54c9a8837120f0e9137dd1fc2f8961cf25049d343f9377edb806f847
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are the primary indicators of compromise, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdb1aeed0c---71322489548.pdf In PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c79b7838703---tetalatomos.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/pabonulilujeto.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/gkcc0ojojn48bjo9g7pdrctlug/modutabesufolitapofukete.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90e5bbd85---vijewodibuwulukatenoj.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6271124013017cae81d92727c1c28a64/merunoj.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210603220334035.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1fc6cbbb8d41112977a1ba30ce7d2ac0/fomozovagomikoseguporek.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/82656126671.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d13c2a7538---fovoto.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/sejaga.pdfIn PDF document text
    • https://primer-spb.ru/files/files/7172373067.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/pavijogowiliniliju.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a49eee65c2f---baxoma.pdfIn PDF document text
    • http://cycling-software.com/files/file/25912858026.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/rokupi.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/xowelolukoxoxuvidafatewom.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/dovuloniladupes.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c769878ccffa3143a1e7a021e1c99792/vanabiribotelenimonager.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e70793237fb---xiletubeze.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/ihckkffr3i874asj2ugetf9mr2/kifaluvujug.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6733defd30---24753378646.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079fe7127803---tumusatudujofir.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/b6b51253319f5a21e3c5450f878bb306/49376499015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pointy+haired+tsumPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 10684 bytes
SHA-256: a1130c6869f8b38a34da50d72505d954d7d8a70b1891c36f7203f96081d097c2
font_02_sfnt_off00013662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13662 7964 bytes
SHA-256: 5c795ff35ff1cc08213c51f8caa11f538f13f967b607496ce431f1d598055a8e
font_03_sfnt_off0001506c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506C 18076 bytes
SHA-256: 22bcf5f0e6796b27f2329916e3757bb41f7a085e844522cc193ab4a358a734ab
font_04_sfnt_off00018021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18021 16204 bytes
SHA-256: b817f40608da110b8c4d26ab2c953b58ba42ea05a8f542ded8334961485d79b0

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