Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdea4890044e295…

MALICIOUS

PDF

87.1 KB Created: 2021-07-01 01:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8f5e39f0556cbd17ff9a55407420de89 SHA-1: 6eda331fda36b26c927954eb7870d994c35e2f06 SHA-256: 4cdea4890044e295aa6bae24efe12e41bb25c8e2048e614e4ff30ea5b6663aa7
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on compromised or disposable domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. ClamAV detection and ML classification strongly suggest malicious intent, with the primary attack pattern being the distribution of links to potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://beta-rc.com/upload/files/20805785402.pdf In PDF document text
    • http://allycatering.com/userfiles/gujizirobusavik.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7474d88ffd168a9a7141f5728ba9dc8d/labawoxurilovevolajopumoj.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/37aae669e5be81d2f01a9b9a7ed46bbc/dajibodejiroxikasetufegej.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/guxuxegafabopejedoz.pdfIn PDF document text
    • https://olterus.com/contents//files/35421825961.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58a7ba394---41548225556.pdfIn PDF document text
    • http://meta-min.com/files/dugemigexipaw.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/faxupakufujabofebuvi.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/72632975436.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/41281289141.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/kuapihfdqk6s1lj27e4j8uuqms/medogifirimulipezekupuv.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc42730ae58---19060401798.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3af7f2759---davoperuguzolupepiwoz.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/dufopebamugenevura.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/79a734b64474ad0bfd4092ef955c390d/zimafisaxekobav.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/37207261278.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b4eb66f29---46887863816.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/80257396419.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607524c07b7c3---7588555232.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/1f14fedf5c2adc619fddfc7ae2697517/53844337079.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/dujadegoxonoxexesulodib.pdfIn PDF document text
    • https://irantruck.ir/data/file/furozodaxaxobekefavakivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+put+your+own+music+in+imoviePDF 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_off0000f09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 17088 bytes
SHA-256: 46d0f568f2d30deff983b8626d14e7056f0d8a3de295c69c194357d5b8f461d1
font_02_sfnt_off0001350f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350F 10684 bytes
SHA-256: 07702bd6d7d105b4e5c9a75379918f4f66a20ab6df3a2c39dac42680dc5de6a2

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