Malicious PDF — malware analysis report

Static analysis result for SHA-256 59de4a16620a9363…

MALICIOUS

PDF

94.5 KB Created: 2021-09-03 13:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11df1d7d052bdcd530dd9c0890126fdb SHA-1: bc15a31c34193f94c3f243dac4b5462e4afff714 SHA-256: 59de4a16620a9363373c3fcd115ba309bba3d30197b2be25bb188fe850275cd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://amphorabeautyclub.com/campannas/file/44390166548.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070b4efa3f2e---85322913231.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4773b710a6---51939492489.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d49ff94b97---32471551683.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ed4720f25---fefilopijezatuzemamunuz.pdfIn PDF document text
    • https://oversaslogistica.it/file/joduvijobajibubokesu.pdfIn PDF document text
    • http://kustari.net/userfiles/file/40544889763.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed5370c25---6973040882.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/jatatalozopab.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/82pjg74uuq84ae2ogu75k0mg77/wogut.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/mifegolafitivojagopezetob.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/5369320538.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/toxije.pdfIn PDF document text
    • https://x-software.cz/data/file/gepodo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a88b21014---kigiv.pdfIn PDF document text
    • https://777mto.com/contents//files/fovasatosefuwokutirul.pdfIn PDF document text
    • http://mlight.cz/archiv/file/16210609414.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621081522.pdfIn PDF document text
    • https://eniedu.com/data/file/20210903120923.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161109ad95daa9---12413420993.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4336d21846df37f572f29378a5679cb6/bodidokaremofo.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/01ea1ab8431bde128aa19ae30cd59e7a/54390636048.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/49977112423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ruppur+nuclear+power+plant+project+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 10712 bytes
SHA-256: b380818fec306acddc49fc7f4c973ef1c12dc46cdb2cc327fd51c5f5b2c89efa
font_01_sfnt_off00010d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12564 23372 bytes
SHA-256: 146ebe393ec3ea5c2d13ab7f258204b5d4576424cbe7ca45265700af9e5c5951
font_03_sfnt_off0001617f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1617F 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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