Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d91f5c1c87a4e70…

MALICIOUS

PDF

95.4 KB Created: 2021-07-07 21:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4fa491482abfff021b0041ff773e553b SHA-1: 57846caab48af677c9feacd97eba00a6cdd32768 SHA-256: 9d91f5c1c87a4e70ecb3f5cea9fb1d960628ddc3bfc748eaee74ca9b5ac939ef
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The file contains numerous external links, many pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content or downloads. No scripts were extracted, but the overall structure and link farm nature strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://philabc.ru/uplcv?utm_term=crossover+ccat+test+answers+pdf PDF link annotation
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd63f31f8d3---lorivewiwaxejelanofeke.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45d44b784---doduv.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/824bg7sn0f9nicmkev86sforo4/87713497320.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/c84c8efa70c846facbc7127f40051d5b/katumogilex.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/30138005023.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/g7vgtj0128n2l5t2a5lmni5g1b/voforufudeluri.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/e1e67ib6c688mrbivmu1cn0nav/60714394197.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b1d3bfb3---kajabemeduzinizova.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/sorowereladawofirotiv.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cf2b07980---tonukivo.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5fd3ab497bb927f169b8357ee2db2a5c/mafusiwujudi.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/lidurukup.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc097576c7e838a23ad743daefa9a074/jizafazelum.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/dd2b93cb5ab59b35a8928d0c31edf928/jopenoredot.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060114175655.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9edb680647---sitokomimisovotipiget.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c391e45260---57406340298.pdfIn PDF document text
    • https://ancoraeducacion.com/images/xojosilojezatusidap.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5cd41db7f---52971118115.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/2d03b1c6877ec4cb1e66af4a64a971b3/pigowifefo.pdfIn PDF document text
    • https://baongochoa.com/upload/file/60233218230.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aaa6c219d---23963115778.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c5d45a9f---zufejudazusiriverab.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/cbbd3a394aef8ecf519df2a1ed87b80b/53913340254.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_off000111c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C2 10660 bytes
SHA-256: b25e5fc375b0310882b156337475eb2713f82c73d1af54934b0698cb599d84db
font_01_sfnt_off00012a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6C 17448 bytes
SHA-256: 7a5f1c6efd7066ad130fd162e9f7e853289b81154d0624d801b023d6208a2d9e
font_02_sfnt_off00015808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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