Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d80e0aef9cf4c0…

MALICIOUS

PDF

82.9 KB Created: 2021-08-28 10:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ce2945a1f9d142336ba00b2c2903ccc SHA-1: 7d8256059b19c5c9639ed4d06eb0e776327b0136 SHA-256: 55d80e0aef9cf4c08f111e94c79a5646f8a5295a635655a02cc43456388a0baa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://wastran.ru/uplcv?utm_term=laceration+without+foreign+body+of+scalp PDF link annotation
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa7a11df5a---7304462226.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f22d3436---gasora.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/nunuv.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/27777792383.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/kakisuxunodipeke.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/89735392485.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/lulobunetes.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/45857057424.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/tapodogojarobufopidubil.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/19819469759.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/12204663946.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6bc7bde5---50647841177.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5310c6b02a---titunurudevebipafise.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611214fb0d66f---78006063410.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/70b2b5c8b3e07c7a3ef43e70e9b393c2/93895232250.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e04eefbe734---54067308453.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/karofugituwisorepubezitox.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/sapaxuforiva.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/41043711936.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1610699725664b---52284223256.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086636281a6f---11234313959.pdfIn PDF document text
    • http://apple888.vn/luutru/files/nimidadetuvowil.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_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 18596 bytes
SHA-256: 142a1737fda6d3c77a7b9989127fd9a05194c7a386c05c0931051b47e482463a
font_01_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 11296 bytes
SHA-256: d6c9308087a50b3892c2c34eadc8fea3908c4df70db25fb76fb8b672ed12bc3f
font_02_sfnt_off00012445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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