Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cbf034f4bcbd6f…

MALICIOUS

PDF

85.3 KB Created: 2021-07-07 12:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 22827f630c4bb910b79ae1f7a7cf3e60 SHA-1: 5902e86af206277f6f85d806d4d27a0550ccc2c1 SHA-256: 50cbf034f4bcbd6ff5dc702a96a6e0d4201dbd4353bb16f26ccae68d11f979b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or scam document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=format+of+income+statement+under+absorption+costing PDF link annotation
    • http://casier-a-bouteilles.fr/file/panepozekoxugutaxubiri.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c470a9e2441---fovozoboso.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6e3789497981bbeb2875257f8cf50e50/15679357147.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/64641367805.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/mulupumowasewivamigopafek.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/lotixiziwuvunebova.pdfIn PDF document text
    • https://lapiadinafelice.it/file/wuzepufefivibujibol.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/lefofuku.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210602215121.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/5104984786.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1541fd88---26309195616.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/roisdb1e7tpsbmrv9lsqp4nrv2/4292585929.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/q8i4rl8l296u8etoa8qcvg4ms6/72591081873.pdfIn PDF document text
    • https://agatanorek.com/files/file/linap.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/36496167839.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e205ab4b5710f63f397a8daa286798a6/40972678867.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/84291843883.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16072047c61890---28106805377.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098385186b17---44904606735.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/enk0t3nbjb6ua2usre25el5dss/10429796993.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/niwataka.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/nuraneweriduweboniruz.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/sadabitatesekagina.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3f07031bd7aed1159bfa3b8aa3b1d59a/37919034017.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_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 11132 bytes
SHA-256: 3949408371f71bbd57cf2ef81f4e4297b436aad9d55fee18e11681305ea59ef3
font_01_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 17552 bytes
SHA-256: af11c71bf3de76aad8b9e2be832ee7ab450f3e8c9e32f1d80268306ce1169d02

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