Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d0dfac652c4718…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 21:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a309ebb71c5b3731b6987f497765138 SHA-1: 2b15570c26be476deb2b27535aecb21e197eedc6 SHA-256: d2d0dfac652c4718a307af1f97d82854847566d982907e0bd260f58bacbb1d83
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161387947a24a8---runopotimon.pdf
    • https://at1-turbo-j3t.com/contents/files/wimevolorolinibeb.pdf
    • http://orderbestwings.com/uploads/files/19186457851.pdf
    • http://novelinternationalschool.com/ckfinder/userfiles/files/lasajenikerisugifinenoxi.pdf
    • https://szabolcsipeter.com/userfiles/file/61176546161.pdf
    • http://mgtuae.com/uploads/file/44008478793.pdf
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/63798510339.pdf
    • http://www.allatpatikapecs.hu/images/file/41350911936.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210913_6485BD3D8C00C243.pdf
    • https://valstybestarnyba.com/upckfinder/files/89920300003.pdf
    • http://paraglider24.de/pics/fotos/1/file/xegare.pdf
    • https://signos.larrialdiak.es/files/galeria/files/karusatakobum.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1e0747d3ec197305013c229cb288f73/dinukijafolo.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bd243cd07---ranofi.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210916_4853F3ACFA2DC287.pdf
    • http://shuimotongyuan.com/userfiles/file/fofelexoxaz.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/vp9q55vcpfllauan94cq24qri0/petivixopesosegosabamimof.pdf
    • http://elhammagazine.com/ckfinder/userfiles/files/42191318582.pdf
    • http://enjoy.sk/editor_uploads/system/files/28199334401.pdf
    • http://print-resource.co.uk/ckfinder/userfiles/files/65659481835.pdf
    • https://landbondcorten.com/attachment/file/af5d7254db5b99664382bca7c0cd99f1.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/00adc2688a673724993e48a8cc58aed0/5995161481.pdf
    • http://redigonda.it/userfiles/files/87474052987.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+write+a+thesis+statement+for+an+expository+essay
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d395.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 16792 bytes
font_01_sfnt_off0000ebac.bin
3c89ae22f7a177aed8e1204db4dfebc9017754987d40e6082ad136ccb43a7afc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 10872 bytes
font_02_sfnt_off000104a8.bin
8bc1f4c041374aeb53c849dbb9d60ef8cbed391fce3020566de434718caf557a
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 17776 bytes