Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d367369e143d9d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 08:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6dce2a89a35475033cefb1f9c2348f11 SHA-1: ea541ea56026263332261e682db7561b694b2087 SHA-256: 69d367369e143d9dac1a10f73d6783f108a687cff6652e703dea9d9a2c1eba07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://medvor.ru/uplcv?utm_term=search+music+by+sound+android PDF link annotation
    • http://austral-immo.com/userfiles/files/92707225310.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/xinekebilanimekizelezed.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/binibadexuxipemuwi.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-2/20210902150251988696.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/fazenubifofu.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/sofamovoletukajogob.pdfIn PDF document text
    • http://dfanchem.com/upload/files/nijipuwe.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ca8e166445dc4bee613f6bd4c4cfad9a/85776375983.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/zowod.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f59903f0d---30099478327.pdfIn PDF document text
    • http://etre-belle.su/images/file/tijorurubivaxipamaninamoz.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/6536885857.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/97522753860.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/75077077698.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/lirabibemawupetifupinize.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613170bad13c3---nozigilekofutajibejokari.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/97dee3e0a9e5b742bfb6bf76faada883/xijisetobiru.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/peketomidovojaferelin.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e4dde969a4574c2449e34e8a279cdb01/49449902831.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/dowufaseritowakefelafe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372c596ff59---pinafuranitaxaxegusala.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/0r6kv4nkiu3ajn525dd0re3ht8/rivasidizaziminubuzokawi.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/80240340900.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/kuranume.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/71280714593.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d2fe76436---78180714726.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_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 10920 bytes
SHA-256: 11721e2d4384754e597d148956a0ddfe2d1ad7d0748c7a584216eb6d3e2a56d2
font_01_sfnt_off0000faed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 17372 bytes
SHA-256: 627f7fd045593971acfa12dc2d5a3e6cc312103de1281ffe996b6a607bcc7b55
font_02_sfnt_off000127e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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