Malicious PDF — malware analysis report

Static analysis result for SHA-256 515770046abf1c5b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-26 12:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dc31235f04baaef865785dc3c77f61f2 SHA-1: 767edfc57fe16db30406b910965275b844b8e873 SHA-256: 515770046abf1c5bc1d7720d220d3aa3f7052c975331c29b80850db8fd9e3c8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. Heuristics suggest it's a phishing or malware distribution lure, and ClamAV detection confirms its malicious nature. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://chcial.ru/uplcv?utm_term=collective+noun+for+class PDF link annotation
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314541a0ce3---liwezuniwowakidur.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/topagujugudejubezavuwonu.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/bezatuvawewud.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143de0b58943---63528563103.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/takulopapelug.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/57509391125.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/lesesuzogepude.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/52682317731.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///86880072997.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/xipegesip.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d34db35e7---pirufok.pdfIn PDF document text
    • http://weingut-suppan.at/files/42235127307.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/87569623363.pdfIn PDF document text
    • http://186086.com/upload/files/janazerajupikotugagun.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/29799364444.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/jixuve.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/pofabuworanuta.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f2a07e7c80060acd18c1bc8f264775ab/66307479711.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/fobovapuviwapawavogotifaw.pdfIn PDF document text
    • https://chimrodistribution.ro/poze_diverse/file/wutegazobo.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/28455538688.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/18297489694.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/62982072438.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/38951431880.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210921222934_1889997300.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/16152400781.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_off0000bcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD1 10528 bytes
SHA-256: bde2c8afac89dcebc97042c5fc8f5ea794e295f63cdeeed43e18d9b120424ada
font_01_sfnt_off0000d500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 17724 bytes
SHA-256: 23d6ee7fe04abcf9b5cbe51a9ea321e2cb3211bcefe7592322dd5b968dd8fea6

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