Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d8cdd303105189…

MALICIOUS

PDF

91.2 KB Created: 2021-07-23 09:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ce5b63dd3b5b9b67a3f7ca3df3861f7 SHA-1: b20b4ebebeeb709adcfc938a34821f05cb7e2eec SHA-256: 96d8cdd3031051893889b1fb5b6c206328eaefdba940fc10030ffdba0a8b2c55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://haidangpc.com/contents/files/35015996696.pdf In PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/316fd3c8a923286bdb1948c8c2c55ea6/jigakimolijogo.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f65aaebb57---vivezipijemenavipekeve.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/bcf48edc7ef410f6a46bb07142ad237e/guluwigatofovesodepukeri.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa6d60931e---64238889187.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085735452562---bimeveropiwipawuv.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/baf1d397c67e68b7703d1b1b69b90aa5/17706147328.pdfIn PDF document text
    • http://memoservicesrl.it/file/pujonudowuvofuvo.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/64754425105.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/68680227723.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9nnqrfnu0q9gpqdhq8c59m6bq6/romaxixamisurozo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3c8a26bc4---vanewusedasawemaxutu.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/xozixid.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/bovoduxefina.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faed59ab50---xurasimuz.pdfIn PDF document text
    • http://lucann.com/Upload/file/60378498981.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/pupegeretamuxu.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/40281350155.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/bepajozetugoposefukudizev.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5915e5099f---73621518453.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083fadc61d93---82891346830.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/puximosukedolutori.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210619_D7D2A55F0B9CB874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ibs+foods+to+eatPDF 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_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 10096 bytes
SHA-256: 361c0412445fcbfd0ad89f294918539049e3f790b3a41aae1c276ce6aa687e48
font_01_sfnt_off000119ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AB 17296 bytes
SHA-256: 825322407874704a0014afaee1958615009eee115ad1cabd1ee9597d60648ad3
font_02_sfnt_off000146d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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