Malicious PDF — malware analysis report

Static analysis result for SHA-256 533b3eec70c04437…

MALICIOUS

PDF

103.0 KB Created: 2021-08-08 19:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7475d3c4acada21ef9505fca364b3b48 SHA-1: 46876db74593d50ee8ddc3433db2c7082758f8c6 SHA-256: 533b3eec70c04437a94f0d98b7013c0c16f89c392d3215f4f5d5af60b571dfb9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure suggests a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rollfactorytogo.com/uploads/files/84413334182.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160afb3b28c89c---likufuvajelupifos.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/bijimewowoliraxitu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0501341b8---xatasezijuwudipigudugitog.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/61354679046.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/87532719985.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160baa2e04e1d4---76189675102.pdfIn PDF document text
    • https://ka-base.no/images_students/files/rafumawovidiwexorip.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/r6ti0tm5ectfvr35tmfkjriiu9/pumobavu.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/94693117860.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/02b8355e0b8951f0c8276e9f61db8820/18914749104.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106062001191385.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/kuribuxavonivogujibajuziv.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/40606370211.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/aaec200d8e7272261ed242300be91e0b/losotes.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/26699782823.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/furimexuwiranewufuxodujuv.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/34034869013.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc975d59a0---43397251273.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b42731877a---8762989336.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/sixakevivegiluna.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/zeperizobimi.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/geborudopenut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gta+san+andreas+best+graphics+modPDF 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_off00012ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14709 17212 bytes
SHA-256: 07362b434a41e64a6575f36c0ea85092d5c7ed90a384e975e0e18aacf94c998b
font_02_sfnt_off000173b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173B2 11096 bytes
SHA-256: c93ca3097f6ec1d43c7fff86c53a9d1701ffe5bbf5a83bf11b165ca7bb03538c