Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec42e03b0e98613…

MALICIOUS

PDF

82.9 KB Created: 2021-09-22 20:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7416e784d9ae16b2324a9997dd3e0036 SHA-1: 97aac0a8f545eaf89da8548ba4133314f0f8b8a0 SHA-256: 4ec42e03b0e9861367d32920f2b38bbd6f5a1168fcb4e581f774630c72d24c78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://bokaichenyu.com/upload/files/xowagelijoxiwopumet.pdf In PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rixawesazos.pdfIn PDF document text
    • https://verner.lt/images/files/46217972428.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/01758gnm5e8ag5fg59r41297pj/17947704925.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/kolepunigun.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/61187534740.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/dulaxezibavogut.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c97e7656366e5311e9b20790cde63ecd/62509150732.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/79582054296.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/22391687965.pdfIn PDF document text
    • http://epplast.com/files/file/44076426170.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/lonepogosew.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161316e9cb142d---mowubev.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210921192520.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/60470729620.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/6118678752.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/xabusawakulebube.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/93164148572.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/zadilif.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/wibomajapirixasaleso.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2ce09e55f---gebowovukejelixegakiwufod.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614341ad541b7---93535874270.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161495dfc4ce63---jebizadira.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/18490873096.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/81790644819.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/17476053519.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2098038a---wixofazenuzesomanitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fast+and+furious+tokyo+drift+full+movie+onlinePDF 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_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 17900 bytes
SHA-256: ba86eb75749b76fecc2fea28c5b6dcba1b90633219d65dc119ecfa7319f7a5d9
font_01_sfnt_off00010c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12484 10864 bytes
SHA-256: 6c133931494d1b2e7eb88cc4dba961b7ae92efff5e4ef6b88ce9014bbcc7f875