Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e69f600280436c…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 02:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e7a89abad50d308d9da1b47dd0888cb0 SHA-1: 8d6378d6667840544e1b62fdf06e2f566c62e7cb SHA-256: 43e69f600280436c04c8b4589c75b1c39f2f76b0afcfa7508c99cac745e90b26
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and presents a link farm, with several URLs pointing to compromised WordPress upload storage and other potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links on disposable hosting, likely to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.rpv-drachten.nl/files/file/76450982134.pdf In PDF document text
    • http://sswjeans.com/files/tavujiduwifigob.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/sesuluge.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/kitodaponixi.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/884091285613e0c4ebd0d5.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/mebatewefesopakabon.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414192ba73e---zobidobobos.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/ximokomamuxaw.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/mediduj.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/35021256381.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138330b81d77---jikamopedosoxob.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210909060958.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/45980365792.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/94395756353.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/83038005960.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/gasukufetovexude.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/notupedalesorutijusitif.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210905135549345.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/rurezakowisaresabuvi.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ce05cea0b---tisefizuveluwubujalewu.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/puzalelikexumetixegaraze.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/43451519966.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/besepurovobisuredata.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/muwepebis.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/gokemabuf.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/35102485553.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/7328007548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=traditional+definition+of+curriculumPDF 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_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 10532 bytes
SHA-256: cfc900aa8d67c28f4d772b71b0fbd55f795a67cd53914b1591964f443c24ce5d
font_01_sfnt_off00010660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 17616 bytes
SHA-256: 9da88634fcf7ae77cf11407aa70f75d3bc7643508c5573533d7b90339774026f
font_02_sfnt_off000133df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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