Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a7650023259a9f…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 15:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bc1c7bdcc7a2ae40eebd170e44c6c2e3 SHA-1: a4967b0a930bae469169a3a2288ea4517a1a0bb4 SHA-256: 93a7650023259a9f1cd7129676b343f46c2d2e93f8e3f10fc847c8433bd9d0fc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting users who click these links. No scripts were extracted, but the structure and URL patterns are common for malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://crysiq.ru/uplcv?utm_term=renewable+resources+at+home PDF link annotation
    • https://sgcaregiver.org/contents/files/xuvidalafameterede.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab8a636b5---56113126622.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04fe564417---83979840915.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608768330d815---tamepujediw.pdfIn PDF document text
    • https://luminex.pl/upload/file/20060101396.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/bufovafifijigasilibipuni.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/3943ef76b9d65cd1155a0c0d902df471/zewapejenupiwutez.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/74318905845.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/lorozobil.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf373a695---repex.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa01095218---74364779049.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5b773e3b3720541b81fe1b5be2be3c75/26309569643.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088da46082f9---wukiwiz.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/geuidqvpjh01ood87f1qsjtr11/bilezexolugujarofemol.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/552fb2a35903732858e1987b70712a6f/sitakivagumazapipusigik.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/aem4dlpht0rq86bsh1ooovt16a/56703816087.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160828add58a3e---18186597588.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/34045355892.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/ripizexakuriguxoz.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8d50e36bc---69506391202.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/difanurajokajenut.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/17815372164.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/juledovi.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_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 10772 bytes
SHA-256: ce88d424d8ae05b38d25f365fa1f21869489079d4ae3f5c9c8d39d0c03cbe87d
font_02_sfnt_off00011e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E81 16652 bytes
SHA-256: a488ba0282ce5abeeb465ee9d551f0400f8c9fb57fb57b13a4c2d94aabde6b8a

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