Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05b79fabd475fea…

MALICIOUS

PDF

91.2 KB Created: 2021-07-13 16:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7070e5593c3203d70834bfe19c450f40 SHA-1: 501bec3141cedb7e561f9187d2ffe57b560a0b7e SHA-256: a05b79fabd475fea83028f557839e4f29c7d75a47d3f4e4ecf79fd7db6b3a08c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates this is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/61f90067018d5d8492696d93b3c88b1d/97568291052.pdf In PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/15566507335.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9bf62c71f---savibox.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/f443a84ba9ced488ee5a4baa0cd39d6c/sizojelinur.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bceeeedd8d---34850312849.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/pmqoeg3svm7lh5uju8o2gvqqi5/73504172051.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f5526f648512506ebfeead3c6228684b/86648187247.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/0a66217d2779cca32bd38f0be820a184/fanudosizawejezajanobo.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/73333615674.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/416f234a74e1c0bf726ce608ee2faf25/niwelozuv.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/newipotefunapukinawex.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/laniditowaxuja.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/ece84298afb04342ebeeea65c8b3dfd9/firoviwogixul.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/4996850383.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d194f687be1---70898768404.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/838af220602b77b5281f5c31f58ad0be/vejiwusewojeramutipuvi.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/25954271548.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa9757cddd---rovade.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/linemuzejerusiles.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080754f7d824---13736110021.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/78513328343.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/safuwirogikupoki.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0e744ffee05961c4defee8ba16beb33b/30469918299.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608718b6d333c---jaxusaja.pdfIn PDF document text
    • http://allycatering.com/userfiles/najozen.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4081b5f05d---rameroramotobele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=year+end+quotes+2021PDF 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_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AA 17328 bytes
SHA-256: 5537d8e5da0d1d4d22a99eaf03613b3d7f3bcbcddd6b2f82fade3429ddd594bd
font_02_sfnt_off000145c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C6 10628 bytes
SHA-256: f8a8f3aa3ecdc05023cb3dfd6bb232fc72873b387b06aed6eca33da565ec7fcf