Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33c58e8af4a5076…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 09:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f48d7c4ee92f12f12ebcc4b6dfe5026c SHA-1: 76120c469a39872e76b93a8416e2729ade9e3073 SHA-256: b33c58e8af4a5076268b4595616e7a174f37cc2e298ff066a184800481186d6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. The presence of embedded JavaScript points to an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://avenue102.com/uploads/file/vedimezodafuzifazituwo.pdf In PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/filowisen.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a962cf9e0d8---70173341963.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b98dbe2e83a---raxebusojudividomuxodet.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/9438936248.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071920dafd10---91967840136.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/2e17f9139331e268f5964efde337b447/15167888731.pdfIn PDF document text
    • http://rhondachem.com/d/files/33726466412.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/67399401743.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/kelev.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161153cbcc9297---5640811903.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/dadobutuwoseduki.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/58bad76ea4cf3f9d294afdf0dfeb4f56/wosowozexodisepadewolot.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/tuzedezaken.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071709eea4d6---roxemuzetetofinakov.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/36af66f4bb30e401d7b1e25d0bb1c01c/95362475956.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160896fc8b638c---gexolojar.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/26166043985.pdfIn PDF document text
    • http://falerisztika.hu/tmp/nozarixerofil.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mbrb4n9qm4orgf2fiffvho2l8i/dobigitutidefawepi.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66941517367.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dc2434288---gamegivaveb.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c81acc017f---78148540735.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/98388486041.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6a0e0fe7---fosimazekimixalogaregos.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/kulepizakukupipirefipu.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/bovenexat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lean+six+sigma+yellow+belt+course+pdfPDF 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_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 18744 bytes
SHA-256: 8372eec957bcda46a281a8b5f863049703c27eb34e9716bf79407f50a24cfb04
font_01_sfnt_off0001190a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13121 11460 bytes
SHA-256: a85c9585001299fd61cfc03fb5429d51a301e9658b869fef72a06aa24ea1deff

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