Malicious PDF — malware analysis report

Static analysis result for SHA-256 226019b0371d9480…

MALICIOUS

PDF

85.1 KB Created: 2021-09-10 18:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b8ba36138d6e717503519edaa090e47 SHA-1: b4e4048045537674e30e6c76c5d42c40ddbf8805 SHA-256: 226019b0371d9480b1fef0db5cc024b8537c10ffe691286ab5136ed0e98110f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7432c7ab318c5013b73ed95d67f89c4d/vepofe.pdf In PDF document text
    • https://truonggiangcompany.com/userfiles/file/mepewupotitezapopubav.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1b2b9ded0708d74ae9766e5677bd30a8/82802744292.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/20931519527.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af44525267---6729080296.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/16170079372.pdfIn PDF document text
    • https://southafricapools.com/contents/files/lumikeze.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/foluwavevinemamozutufa.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/15158382681.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/vakin.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/gemeluwoxawuju.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/34538400055.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/duliv.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/nazalu.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/60435647741.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/jenodin.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109020032223355.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/pekizeb.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/55870941546.pdfIn PDF document text
    • http://brukbet.com/user_images/file/kenurenebowupenap.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/1426928618.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210909061417.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/moxizagoruj.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/xewenugikesixadujarij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=apk+obb+installerPDF 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_off0000e0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F4 20556 bytes
SHA-256: 4bb4441714605596c32bd7bc53edb10e43f8de81ecb9b1004e2bf5aa297839a0
font_01_sfnt_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F20 10456 bytes
SHA-256: 69c276d2e407214ff2f7bf63c9c2ceac51b53ddc8cba600df007701be73df33e

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