Malicious PDF — malware analysis report

Static analysis result for SHA-256 492e22bd4f6c63d7…

MALICIOUS

PDF

75.5 KB Created: 2021-09-07 07:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b33cdb9571c4d9881f01058192c26396 SHA-1: ea8359718b4d754e7aa51c5de3bf4c728c54a46a SHA-256: 492e22bd4f6c63d7d6115dabe15908164a1d1968bcceef80026015ad1058eaa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the true malicious destination by using a variety of hosting providers and potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://betenrealestate.com/sites/default/files/file/wasawafoteme.pdf In PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/7a99e9aeea5778a7569096206701a32c/25002415514.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/wazigeve.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/zezobexa.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/533ccb1b65931361c7ae5c5e58207fb3/mawexufajevor.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7b3f9ee550178e5809e87c1bb42f647c/16371467229.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/niveripibipu.pdfIn PDF document text
    • http://ezibra.pl/upload//file/wexesepafaw.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/mupadobizepijep.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/89468174093.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/gogiwijerawa.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/rajid.pdfIn PDF document text
    • http://viorina-deko.com/images/file/4582870765.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/682f4f3a903ad550baffee7fd875efba/66732500278.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/11cd0fabcf8403d0298a096161120ba5/gelovorodumunepe.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/bafuwefu.pdfIn PDF document text
    • http://parfumland.sk/upl/94585758335.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/bezasofejaw.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/woxowopedotilogusofogubi.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/mofulubakovewisedabevef.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/82289290102.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb18e2f81---84035601994.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/78855096879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ge+profile+refrigerator+parts+manualPDF 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_off0000c1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 10840 bytes
SHA-256: 01d6b791f8de0a918f8baaec2d2b03f5c774fcebdfacf911614955281d5648aa
font_02_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 17980 bytes
SHA-256: a4fbc1df06e669ba50331d717780275b13500adb034c83ec22539d1ef5c4895f