Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ee63f560310ae89…

MALICIOUS

PDF

148.8 KB Created: 2021-07-18 03:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7df4433b323eb916f3a61d3fe2f1b386 SHA-1: 2a2559479de24a444dd696013b5b71f291514efd SHA-256: 0ee63f560310ae89f15357fd5e0bcb84193ef7ca5e9b11fe76d0152bae5c8364
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/1fed1a13505d4d236c33517b1583da39/96405449616.pdf In PDF document text
    • http://langmypham.com/luutru/files/rinasefa.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/varosepi.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/c9e1643f84ae1f2e9124d7a82eae337c/1446489610.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/99561916216.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/702a7576ec55402cb7467e75554e5139/nenifanigowekurogobur.pdfIn PDF document text
    • https://masukpt1.com/contents//files/pelozez.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/85364757640.pdfIn PDF document text
    • http://rideco.hu/upload/file/63238140906.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aabiqk735p63f549845gmd7nl6/nugubevimumozava.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9204dd4c8b---69981592959.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/46054849948.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f220c51836b---roxujeresatudebogozan.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca60fc0e50---49554632736.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/pexisipisiruxelobakemeg.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/sewozenavifiguvi.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/denoxobuvupulinuromegotij.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080e37a9eaf3---vilopetenose.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/1044be79b7be6fbc9ecdac9041a85ff0/90303535138.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/fimomiwax.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c839f4886b665f10b4770dfc0ea65333/wazemaroxexamanex.pdfIn PDF document text
    • http://web68s.com/upload/files/pewizusufu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e02613ed80---xupukevudemuwoz.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/48883483199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=within+a+short+timePDF link annotation
    • https://www.oxfordlearnersdictionaries.com/deIn PDF document text
    • 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_off0001e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E947 17236 bytes
SHA-256: 6d6e4afb6801e99189843c8967cac484f31b1d94104dcd9fda97b073bd9a1ec3
font_01_sfnt_off00021668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E7F 10320 bytes
SHA-256: 20a8f5dcc9165cfb1da9070c88e6bf117aa20dfd9efd33a4d26420bb88778ed6

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