Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17c7bef0133e535…

MALICIOUS

PDF

96.7 KB Created: 2021-09-06 11:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c3c7421b464e33e8423ea61646bdbb04 SHA-1: e554c4da6927f6af0a2180184d6df69b069b77ed SHA-256: d17c7bef0133e535e1d586f619780c8cd8c4a3f9c65b883cc01b42feada41868
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://greenbrier101.com/userimages/62152798782.pdf In PDF document text
    • https://zionapostolicministries.org/uploads/file/43345097311.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a4115e9ab3e857996d5ffd01470d7300/41360485921.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/gazube.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/51748946140.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8108f694---59469861864.pdfIn PDF document text
    • https://angkalaris.com/contents/files/69120305872.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/xuxazofisedirogedeto.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/vasukagelozuzasaj.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/80fccc983749f096ecffa6e2365e95f7/73972675581.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/8809065850.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/bekazunuleduzubagadam.pdfIn PDF document text
    • https://bselink.com/userfiles/file/mivel.pdfIn PDF document text
    • http://altinay-law.com/images/file/megugepusamokurudo.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/43066637973.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a723cb92f1e---rajijozela.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/93622340105.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/3hmvq1dhdakt0ue5434kden6u7/35944838499.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/pif95mrdsti5f7d914scp8h5oj/fazenaladav.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/vuxojosowug.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/7234978254.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/362c0a0c9ed950b6bb4f5294f0b2557e/75975640541.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160847259b175a---55132545140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=craft+beer+brewing+process+pdfPDF 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_off000114fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D11 11008 bytes
SHA-256: eb92273ef7eb3c4594d9de3e7f876bfc9b4c6a61c0b9ab19996c2980e6b5c05b
font_02_sfnt_off00014671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14671 18012 bytes
SHA-256: 156a49547aaabf493fedbbe90352664f2eb79854989fb22067984db3a86cc435

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