Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a2b35fdc04d456…

MALICIOUS

PDF

88.2 KB Created: 2021-09-07 04:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ee8b600f28ba686f01543b0ed0bc7c4 SHA-1: ae12379e074b825cad933e70392f32220699c0aa SHA-256: 95a2b35fdc04d4560379b4089a8161f38ac316d0446370b75babd98dc05ede40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://agmatbaa.com/upload/files/63618117129.pdf In PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/37e8001ff65d66ba8be1d8f4cf970b84/44814442038.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6avevc46gg86vasb6jc5ukhme5/vineroxu.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/luziserasukimo.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/vomiluvelifosebigipowo.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/tajubejerirakoro.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/sutusitenujapamoneruv.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a08d4d9ad3b---bivadexebufenazibu.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc56478758c---fivuwokowokivukal.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/40c502e69e5edd97f2b59dba54d8e4b8/pujokanabizoj.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/58b5987bb00feade73de3f3a50b268d1/migulizujodo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612a1cb69af4e---53788868750.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/pefomafib.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1237489977.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080670501e8e---18337290709.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/r5d2tbqdrfoto7i83qrpcplvo2/4662745659.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4e3360546---34011506215.pdfIn PDF document text
    • http://mamam.by/upload/File/file/gepasurex.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609efcee72218---51473734342.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109b75eeee42---zesodidopipipube.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/nipuxezuretijopawojinedis.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/gemiloguvopewaresezigiv.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/74fad60a35167fe4e903edba96d26d24/lerokawidadinusalivudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=commercial+sublease+agreement+california+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_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 11236 bytes
SHA-256: 7b2e8993d83e693619c35d1f83147611a685e17649857fbcf91e9c4d60780aed
font_01_sfnt_off00010eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB8 17368 bytes
SHA-256: 16f3ab89a35055062640dc4de1e3e48f1ae6dd8f63984c754cddc8b4c1892573
font_02_sfnt_off00013ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1