Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b68683ca0054c20…

MALICIOUS

PDF

89.1 KB Created: 2021-09-19 22:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c529ced51e8216e93e14ea44e2521cc4 SHA-1: 1fd27ac8955b1aa83dbcd724356adfd1f0dbeee4 SHA-256: 8b68683ca0054c2022fd88b44c7c1e2626491ea97a3bae52aa5494926a49d0f5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://cuisinescartier.ca/upload/editor/file/mamawadivoratodibazudise.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fe7878b7a720715f71625966be522b7f/26191725290.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/sodidi.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/nunof.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/87820407999.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/wapuzelobulo.pdfIn PDF document text
    • http://baoveantam.org/upload/files/10439846232.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/kewikipazewopazobora.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/vonoluge.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/foviwevufax.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/21709457960.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/85954230124.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/duxatejapiwene.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/boxapa.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/zajunalafuwat.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142267ae96d7---tutiworozudiwenifegi.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/kusosaxofisudiw.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8009608e0---88051108254.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210915165728_nfxp0s.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7f786d1ea7a755b0ab7e09bc6dc9dace/tijuwariditemoduxu.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/gimuxowegonuruxojusizogi.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/96536521984.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/19098063807.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/zopekalipixelujugezege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=baloons+td+7PDF 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_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 10020 bytes
SHA-256: f99d21b0d317fa8f0ad8ccfb3b4b7473caadc381c55189fa7a7e7b5729979f19
font_01_sfnt_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 18316 bytes
SHA-256: 1af6157b270748323c7d13615a9781d643ff104cc2c78e0a035c385a7c7b22bb
font_02_sfnt_off00013e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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