Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d342f40cb41ffe0…

MALICIOUS

PDF

104.0 KB Created: 2021-07-06 07:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 328302b28317a9152dc766f1ca490f8f SHA-1: a4b3694fa11aad455793c9c8c7f0c03cb4b1c186 SHA-256: 8d342f40cb41ffe04fa0146f9854811c5f6836f95f6001dcd070d01e4c1e8d6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://grawerlik.pl/userfiles/file/75388722863.pdf In PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/lqt2g7vpaef738eoncsmrl7p1j/1863673987.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f745416f8100ae31b33f74ccc119812f/29703540208.pdfIn PDF document text
    • http://deauville.ru/files/file/mopirerubixomuvazes.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/39682634135.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/pajekuvuvab.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/51237679503.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f280066a5---gosobikonibisigifofijasaf.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/76760307190.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba8f9edd2a---99569796112.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/490cbfl9v3dqql3r8m6t543nc8/xekojovuba.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2f800081a4848a972d1ac2a79d06cdff/86465495268.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/a7af596b82faea20fb8c337e6be922dd/19092055125.pdfIn PDF document text
    • https://noddy.nu/images/file/12580481929.pdfIn PDF document text
    • https://tonitomov.com/picture/file/41026549023.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/51155051420.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/1a43743b659e45ea87e5097faeb15b84/40410195335.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9524b0d5a12953929c0e2f4879fb882c/vevozi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f4422220c---19820319388.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/78300426589.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160adf95cb2104---59110553320.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160800beacf5d3---14253060953.pdfIn PDF document text
    • http://santeh.md/img/files/21897222617.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/17a63521bf133ceb338ec94ee0c8da96/litinakojozefivom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=togaf+questions+and+answers+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_off000131f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0A 18300 bytes
SHA-256: 36c5106e438f9f23d736e08b752c734699f30408c0a977d261f1fd01ed8f917a
font_02_sfnt_off000179cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179CD 10924 bytes
SHA-256: c3c4ed779430312e2ecddf78c190ea4ecbc0a98104475e88369db71dcb57b9eb

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