Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e1e10781645167…

MALICIOUS

PDF

98.9 KB Created: 2021-10-07 00:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4232d212f109e0fa1dff57578f9f22c0 SHA-1: 4df7e2fd46bf2bc5bcace0cca09b67484728177c SHA-256: 25e1e10781645167234902266c09a1bf5443c37c9494bdefec3b18ab57e43553
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, including one pointing to a WordPress upload directory, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=sky+view+quotes PDF link annotation
    • https://cesiedizioni.com/userfiles/file/70997582412.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/sipuvofazemofojizumewifo.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/64724358506.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/wijuduj.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158fe4e873cf---javibogaliwape.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/19653639929.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/61003528715.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109300415111464.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/802437a7d908b750073d06d41e94f702/gubudafowesizevi.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210905052415.pdfIn PDF document text
    • http://przybyszewski.org/image/file/35332466697.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/90388713880.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/93047452890.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/65654085678.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/jabexap.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/30098460776.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/93328169135.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/230901821.pdfIn PDF document text
    • http://obrazyramix.pl/userfiles/file/10724262510.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/8699011134.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6ilpkueg3u3uj1p5nir1cma5p8/80111091210.pdfIn PDF document text
    • http://beta-rc.com/upload/files/80138732863.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4dcd0c7ab36b829b4b9328135e29730f/29521767454.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/puxelu.pdfIn 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_off0001199b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199B 10368 bytes
SHA-256: ac4f8f55f778ee52ecf86f76b199fc3ea3a789ae2f042d186b41d9a4f7d3a063
font_01_sfnt_off00013146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13146 20456 bytes
SHA-256: 219847bd69e96e7d1cb1340e04c03f23c8d8323e49835d340b13e25ae7272227
font_02_sfnt_off0001664b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1664B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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