Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8d2f6337003b64…

MALICIOUS

PDF

79.7 KB Created: 2021-07-15 19:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b5b82047d6dd5b699e70e90a2b4f8606 SHA-1: ad88b75909a0b43e6eca3249a7b05aa63b3dc190 SHA-256: 7a8d2f6337003b64a0fa9fbd4459f54221fcca34421273296fd10f90c1510e95
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of these links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087469d91b39---61496135307.pdf In PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f012c41a8ac---gepexibowopizul.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/9881948956.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/rinub.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efe76c7970---41569833390.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d469764720---74216477982.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/73hch7nhqa14363f1uirnl6v60/sivejanulipopevuxoz.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a3fe7f45e89d80813fdeee31509b6cbe/nexokefidodojatufuje.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/jeselizivodiluwojizoz.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a0d40b677---gupifepovikevobeb.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/5aa735872d735db81309f577818ceef7/jatomise.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/38161619594.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/zotuf.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0115c5861a61023a7655a31f7593516/xubasozukezazurup.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084273ce24e4---lovuxafasoruvalivusuxaze.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38ff308355---82739619129.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971cc5c40a8---lelunomegatesugudawefiz.pdfIn PDF document text
    • http://fittbikese.hu/files/file/widat.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8c423c1c---15480037394.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aecd1722c3e---tumivef.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/18628092262.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/4096540330a823ab1c69deed5f0bb151/zaravakared.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/b1e3e292dc740f9aa1febdb686201778/19106033450.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c6c59b806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+find+linearizationPDF 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_off0000d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 10316 bytes
SHA-256: 979eaf54bfa8b177cf1b0eafec107a11fe2045bd22d7b449afdd5294bf0388fc
font_01_sfnt_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 17092 bytes
SHA-256: 54b1a36a21a8695be22f20542d17d7b5f08be7129658016d5b55f9286c052ceb

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