Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb07a7c2568892fe…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 06:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: fbfb74c5a1d47a164d91d7f3215e3946 SHA-1: 774bf206b6be4393ee41056c0a92ff8f4a7a687d SHA-256: fb07a7c2568892feb1eb37c5579be025a1e8e75d5fec93176415af455f1dedbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9912

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://nebo52.ru/uploads/files/rumodegot.pdf In PDF document text
    • http://fine-trading-knotwork.com/uploads/media/barovesepap.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/10164051851.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/tulerufelisivitexes.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fd4df54d4bb---74387806864.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8a98cd73a15c1b0207c089e985428fdc/30045210810.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/volojexinoz.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/75211470359.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3efead5c5---lazinab.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/gifapugepujidewoxat.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087e8e90fe48---piwozimomurapoxadakovavem.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/lemowe.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/2ml0c3j8tna670fupt5q0juldv/wesodinaluxefuxow.pdfIn PDF document text
    • http://web68s.com/upload/files/watorulif.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/giroxetijafilowejukerogel.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/5mvcj99qgottj0lpfa2qvp35qp/50883816549.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afe9e07e1e---sagerepesubesukuzane.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/kepubalaf.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/bovamubefukigiv.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a866134366c---9364580028.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/95573493146.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e03538962e0---72391772390.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904022834416820.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/26522823408.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/14537521822.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871ee4028f3---dejasoziloge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=glycopyrrolate+davis+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_off0000e785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 17244 bytes
SHA-256: 831a8b4e634152945e0a6f8dc657922cd04943315374df58894407c977f32196
font_02_sfnt_off00012c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C39 10728 bytes
SHA-256: 9b01b33bdaf0c755917cbcc58905554b0cc906cb075654973909975e9eddac18

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