Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d73ed00990eb7d9…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 13:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9b88b267cd48a4e2506c2ba69561bab4 SHA-1: db3914a7efb4f286f02782099deadf08b033be54 SHA-256: 7d73ed00990eb7d9bd41a67de57ae1a60b9b49d54242cdd6d0c2db93232194c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of 'utm_term=search+pdf+document+for+text' in one URL suggests an attempt to manipulate search engine results or track user clicks, consistent with phishing or spam campaigns. No scripts were extracted, but the structure and URL patterns indicate a likely attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=search+pdf+document+for+text PDF link annotation
    • http://phoiinnhiet.com/images/uploads/files/razufewebunexumexibuk.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/nuzelare.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/lizivifasuw.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d969c1e3a---muvozebolukud.pdfIn PDF document text
    • http://premo.at/userfiles/file/ziwejevidifinaka.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/7e20c991d6a33466270971cdab510e40/divepinezimaw.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/84905248441.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa25c1f63---16034426674.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/27457869951.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08735e5040---30030728165.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/pafikonajinemelelizak.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/zujekuvupuruwike.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/jabofitimirew.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/towopixojivijibutojijaju.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/nifopulizezununovadexili.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/bakesewadolajevenu.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/36341988869.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/44309500993.pdfIn PDF document text
    • http://fitviewer.biz/files/file/19775570099.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080062fd2163---54283294865.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/daxowodosebuvegit.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63a68d6ef---48239277946.pdfIn PDF document text
    • https://alutat.com/data/file/sepipa.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42789ae4f0---11453681633.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_off0000d495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 10856 bytes
SHA-256: 63b0711ae9a130efba57384176a2e42df4f99afa2b1cab0801e7ac5a132fcac3
font_01_sfnt_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 17060 bytes
SHA-256: 06c1bf5403720f9091512713b29be8f0b7302dfc18f0b01818b46b3e1b28b4ef
font_02_sfnt_off000119b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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