Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5887a759e2b0509…

MALICIOUS

PDF

73.4 KB Created: 2021-06-29 11:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2f52f4c6f775e4afc4c55e8a60afe02c SHA-1: f69514ca6a968bbc1fda24da8bd60b2c8682b35e SHA-256: d5887a759e2b05093b29faea3ea4e5c605fa5598d9d403aba27c06320f5aa5f4
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple distinct hosts and the use of UTM parameters in one URL further support the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--o79av69abka850ab6c.com/upload/file/202105260120029610.pdf In PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e5e22de87---fadojodale.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6cd064057b67cca260f5cf5d21fded8c/55127899352.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/36607036997.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ut281qe5uj3spmhs9l4hs58k0t/66927739832.pdfIn PDF document text
    • https://keongracun.org/contents//files/86819191086.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4aa52acd5---temilawezejuxexozow.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/0ad48c0b8bae5bfacd5b261a01dcaf33/90684274940.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/renupinukosowanowom.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/40aff318e063ab4f6e193a26207229c5/widuwalatavaxogunuwumenos.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/f16t71rlbnevfobl621g19m7r4/fogobazuzinojinuledo.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/3b4b4d7e4ba095efee72afbe5d4afff5/34203207027.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4c2ccd61e---dopanurajonepis.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/81202004510.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b39ae75fd4f---31003515546.pdfIn PDF document text
    • http://accronline.com/userfiles/file/finexevimanomosodowozoji.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7eb454644---85041580645.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c93b474eea---womaza.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e2b5c40f4b83e76c612a4fa789d89464/wejude.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a16285f664---66002681562.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b9145f9a---tumoxevesajuwinuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=50+bmg+out+of+12+gaugePDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/66265561967.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_off0000bb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB58 10616 bytes
SHA-256: 27889f54b2f8079ffc561dd5ba3e6fd60c4b1bf502315645c28d942ff7693c8b
font_01_sfnt_off0000d3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C6 16856 bytes
SHA-256: d0c46c02ea9f35b45b265e3d2043fd1013c71142d3f918d0cdc1e57701be457b
font_02_sfnt_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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