Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4694e93c6eace2c…

MALICIOUS

PDF

106.9 KB Created: 2021-06-29 20:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8c2f99963052e993b10b63f82ca5b695 SHA-1: 79e49443c9dc0b9581072da296409af6b6ca47ee SHA-256: c4694e93c6eace2cf7803f82e0e62e46fa1d17318c8adb6efa80ff32a3522b1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious or phishing content. The presence of numerous links to distinct hosts, many of which are associated with compromised CMS uploads, indicates a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a489cad51c---49754304080.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aba0626a7e1---54546034952.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/64011b5efe3dac8610db763e16ee5da6/75284928383.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/01103a34ce64d3d6461f993800e00753/87766326148.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/spmn8p3vkt3f3iovck4u2o7q84/lowituzukijefulizomameno.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6a32a5c3b0280e2cf2199e2a740a8220/vuduf.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b14d16d83---guxazekadume.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770a4ed4208---ragepavojusoloxubavene.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/vmsffu2lbijfl4vjgci4hq1o93/68913069791.pdfIn PDF document text
    • http://dzbnf.com/upload/file///27732079489.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/12525181457.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/71959918967.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/nadeposikotaj.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/5bn77p0qb3q0661ljd45bbgcpn/61348008121.pdfIn PDF document text
    • http://iphysiology.ru/upload/kowabafikovavinujite.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/e8fcc4d9cb080339a38652e24e6c9031/15245859762.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aae9a9da0e3---zotimure.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a0e6c6aea---66631806896.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/16409533625.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/60958b5eda5cdaa2638c7fdac30c006f/zurivugekubi.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/wuzowumumoz.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/cce2d5563c41d6f4783ab5a54d145820/fakodaxarexubavened.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210611012932.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/39092584641.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02ebe3bfeb---werenalifasijaruk.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/u7iaghfe8birrliher3gskb543/55669677360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=quadratic+function+problems+with+answersPDF 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_off00013853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13853 11268 bytes
SHA-256: 6c48ffe879060db11b118f7195e51ce2b3268d9ed5aa89a78a26fc58244dd654
font_01_sfnt_off0001527b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A8D 18740 bytes
SHA-256: 5d3ff0a9160833b6327ec4d794e6a7e0ea12f609c68e6dd0dcda94bcdcb8139b

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