Malicious PDF — malware analysis report

Static analysis result for SHA-256 050e870948c07689…

MALICIOUS

PDF

92.2 KB Created: 2021-07-28 07:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ffef210243b43bb2692fd7f1c05c203 SHA-1: ee4f9b8b8cb0f2a1fa9f8017fe15532e4077f0dc SHA-256: 050e870948c07689eece3a5806d41d7edae39996fce9c66579618e178a6db979
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://chinese-wall.tw/upload/files/mexipejekizafezit.pdf In PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/tegesiz.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ea39d7459---purikojexixukigupif.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/rufudokozaforavib.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/56360695582.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/55274323900.pdfIn PDF document text
    • http://isgsrl.it/images/file/zozuboga.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/vec78p9tia5i45g1it4co2fp2n/duradesi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c47d4941---69065738865.pdfIn PDF document text
    • http://gtshotel.it/images/file/56647963508.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/24557437189.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/96362708008.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885cc0d87b4---73851678602.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b52a541da---vajijokabubaxoz.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/27158699856.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db5f672d73d---xuvegijomunobowor.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/21712425235.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085fd50df872---rofenidubesuxugotilu.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/bf2c58047191568b7acf9641bdb7217b/wikimivizamadukiv.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/e950a96e89fd2c0fb9b3511581a281a4/reresisurobazelap.pdfIn PDF document text
    • https://loctra.net/userfiles/file/66044666267.pdfIn PDF document text
    • http://churchillreunion.com/clients/72216/File/82910643761.pdfIn PDF document text
    • https://europartner2.pl/uploads/wivaduxogipikegoxelofeb.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/ropotusawateja.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/dogufibinuneniramenana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+combine+keto+and+mediterranean+dietPDF 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_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 17340 bytes
SHA-256: b5ffd1a71a9505d7583ae52af30abeafbb7eb7ea97824e607883759f1909cb43
font_01_sfnt_off0001315f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14976 10628 bytes
SHA-256: 4a9c1b795ada165805c2ee2322a094e77d5cb98e027dc28513c5247a915b5963

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