Malicious PDF — malware analysis report

Static analysis result for SHA-256 33dfebbaafe640d6…

MALICIOUS

PDF

87.3 KB Created: 2021-07-03 00:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6d065585c289a6d7b2059acd493d5aaf SHA-1: b87e78210f714c1625d7b606cb9fd59959e462cf SHA-256: 33dfebbaafe640d691b54c246b8a9ba273bbe2f03e7867dd375a113aad736893
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure and numerous external links are characteristic of a lure document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://bjsixiang.com/jingkelun/userfiles/files/20210703054321.pdf In PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa1b3253cf7c85576b5daad57e964dff/2840606323.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/24af4248f5338a2bd01af74ec2e18f3c/51373680263.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927cdfb7343---wosusowibunu.pdfIn PDF document text
    • https://stvorki.ru/files/file/87300901047.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/fdb36885f38357282eb544f51a630178/midedujedajizifex.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4jodbup9spsu6m62rmpb21mp7q/38669007991.pdfIn PDF document text
    • http://fitviewer.biz/files/file/46489442844.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/bv7d7ahma4qsgglbkaijd172b3/xapufanurepivel.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ac58deaf101---puxuzetusuwupowe.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/84633895257.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/41b9fdf1c5ad8a069efa0f7109993d26/40938897090.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/lurav.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/noguxetidapotiximad.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/tnb63badr0e4thadcm1q0g86ek/vajuxotot.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/42338841187.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/dubesunomuguzovapifakef.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/vazatofak.pdfIn PDF document text
    • http://renault-service.com/userfiles/25362548343.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/32eedb63e38d5066d5c8fbc78bb1372d/xisekaluwixuxepama.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2799e6ab51e0364d1b30b7c81a154ae4/96362203194.pdfIn PDF document text
    • http://sushi-belovo.ru/files/fivisebemaka.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd36b8e6192---womizufesek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=we+hope+thatPDF 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_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4B 17168 bytes
SHA-256: 093aa82c41c748074912e82c7e9083c8da054fcc5b82c546d0166e356e764a11
font_02_sfnt_off00013af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF0 9832 bytes
SHA-256: 81df67ac02cf5712dc44db5d28eff277f8ad834d2c8118a1941d914b5e5c9701

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