Malicious PDF — malware analysis report

Static analysis result for SHA-256 19de38167b265b2f…

MALICIOUS

PDF

82.5 KB Created: 2021-08-26 02:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3e76c35533b29bdb70bf512419b005e3 SHA-1: ce6e4accaf8b3204e7fd9fdd84fb7d00eb94f13a SHA-256: 19de38167b265b2f810764c5a9bc207d5205c97e51c7b9e719f01ea1e9f72530
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The PDF also features a large number of external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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://lecostationery.com/files/file/55023561354.pdf In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbf5bbed3c---nakelifixufe.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/dfa8b3450a131c4a8d4865a396eaf8ce/14242157850.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/17611910828.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ede1e64a2f2---56285829752.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/17788336120.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608521cb33fe0---tezizuropemuz.pdfIn PDF document text
    • http://wych123.com/upload/files/povotudiwomigiges.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/mikirujasubim.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/mosefudetabekufi.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/206d6c80f2e14860722d325700dc3e51/kanetubodixe.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/sivuminodunil.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3cca22863c981c146a0c425ba6c6d6cf/99127530008.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/mulapesogejebu.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/99625477710.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e38b032458---87980798729.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/64404361231.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mizikagex.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d2436a2e6c2---77887908738.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/888e6e4dc9785834df590b623a4ba81d/7727616824.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/23737397646.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/dozukuboletopotesafa.pdfIn PDF document text
    • https://hojoairport.com/images/file/vujofogexoxomufam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=told+me+not+toPDF 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_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 18540 bytes
SHA-256: 895c14dab04469d27cb0aa5458eca0ae195f3cc55106688008173485918c43ec
font_01_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 9852 bytes
SHA-256: b87e6b0380e949c292a96e2334092fee83ee0ada71ad36259527b6b3ca6ff675

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