Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c58c0cdb8e6105…

MALICIOUS

PDF

83.3 KB Created: 2021-07-02 18:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 58a174b944f289c92628737b31634445 SHA-1: 750ab2e6362c6c24598b2432ebd8173da22b2eaf SHA-256: e4c58c0cdb8e6105742f785c97e07db25aa3b570e8540da3d6e1d87f739c3d7a
164 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to host and distribute malicious files. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a fake invoice or payment request to trick users into interacting with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c708f32da23---zidanuxukixidukiji.pdf In PDF document text
    • http://www.companyforte.com/imagenes/editor/file/4191190142.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/59546221496.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/84252557149.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071e5c791ab5---kowotabaramixesixaser.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/nakile.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/dotux.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/34845321179.pdfIn PDF document text
    • https://ecoretras.com/file/34404795933.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/erolu84gbamtfuh1fh4tl8d6fe/kubex.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/af5de2ddd153e5110373010a089fd258/79342869762.pdfIn PDF document text
    • https://rajaunited.com/contents//files/jenekovobabiduked.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8589cbf07---21423739279.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077a956d7949---pisesugimuforisifezijego.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe150c5617---82090554661.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/071da3823662f9d8c49c881890c194e4/33663296411.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/12385777800.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/xibupal.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/kekatajerewanex.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/370697119d815925f6b78c49a7cfbb76/gosorotasozagililoxebi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b8bd278d8f4e1521d9c1d5ad58edea1d/90571164403.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0de6136d---gumeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=payables+and+receivablesPDF 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_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 10464 bytes
SHA-256: 70c168f2b0fe87b96b5878a55df6e9188b64c73ca155296daa62fc713f96bf4a
font_01_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 17576 bytes
SHA-256: 9251e100ccd3204d9eecb506562148657ca9fd5e7297e0c2218e6a0c8f62042d
font_02_sfnt_off00012821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12821 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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