Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa7e1e3bac6f15b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 23:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb5910be765ca36dea5c74dbc1870d12 SHA-1: 5c5dd7214bc4584fc7ddf7117e83f3e0ed982a01 SHA-256: 8fa7e1e3bac6f15b7bff89dd9d4df10323c0455742fb8a44023c0605886d906a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The file's structure and the nature of the URLs suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://beautyyaurient.com/editor_upload/file/tovop.pdf In PDF document text
    • http://duda-tech.pl/dudatech/upload/file/49868771437.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/56550945149.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8025049227---32935175319.pdfIn PDF document text
    • http://salkim.com/userfiles/file/63555751305.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076f63fa5425---7078228470.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/85154954354.pdfIn PDF document text
    • https://drlanda.hu/user/file/tagatuwovivud.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a26c10133b---29428183171.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d0c2778fc---27254943096.pdfIn PDF document text
    • https://loctra.net/userfiles/file/sexekijujewunavafos.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/zatogamiviferupo.pdfIn PDF document text
    • http://pbsdeltarho50events.org/clients/d/dc/dc3fcb918f61c9276c5829b035df2abc/File/wevonirebofizevudimu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0545415e6b---23781744346.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/18902108239.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/dixodakevag.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077e59bee249---fafivumubobuba.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae18d243e9---94139582380.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/37020807412.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/76554619940.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/nusisas.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/gasemawizuzizixax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=forecasting+methods+and+applications+pdf+wileyPDF 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_off0000d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 11244 bytes
SHA-256: f480c0c53cade5c51aed88059d276b245369b7273989df8f4282ed58296aa062
font_02_sfnt_off00010821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 17956 bytes
SHA-256: f174c205ca1e4279aaccf4a7b93012a4084927472547030f44de16f64aef5b39

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