Malicious PDF — malware analysis report

Static analysis result for SHA-256 3272890be520b82e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 03:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b87cc6f8d439837199d67081854eefa0 SHA-1: 45e07a951fdb793cbbb764733b7eea512aeaef93 SHA-256: 3272890be520b82e8930fc256bacc3c34e5c259f2eb94f3ec6d511e82ba8e48d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The presence of multiple external URIs, many pointing to compromised CMS uploads and link farms, strongly suggests a phishing or malware distribution campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://bonfiremadigan.com/uploads/fckeditor/file/kijon.pdf In PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/hqp66gkfpgba7mp7mjg3h5jd0t/62302674350.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/felojutepilibalewedaxawa.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/42230693021.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607780b31b912---66997400117.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b1d23359e8aee8db1b89ba2d9bc137bf/69537430755.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/gunomujoxuna.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/sopazakenis.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4c0eb629eafc5c46e7c1a7c3fad5ba64/gewifotidijadugananoru.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f2408c6714e366ae62be2d727198c44a/ratodomigasumume.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/basavazakekamasa.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0c1dd65e3---12652463087.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210522115045253957767.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803bcef0aa2---zedor.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/95978938665.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/56884370742.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e2c4b26d16c2a4b49e021a064ed3f422/92302986346.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8e1ead5c5---tetavit.pdfIn PDF document text
    • http://jadeite.ru/images/file/83054014154.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/15928df2d2d8d585a8efa01d4419b585/bekulotup.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/resujavonug.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/65848409306.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/kiwiverilo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/bd07cc0a8ae98b633759b87454e53481/bepekotefoxivofivokanibex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=buet+admission+question+2018-19+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_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 20516 bytes
SHA-256: c33f4ebc204e5d6d9400559e887b8ece46667935c113f0f617b6cddde92358be
font_02_sfnt_off000127af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 11516 bytes
SHA-256: 9a701d7ed540bf3493c303c6d035e14650a648a3d126f493d87baf4e9eee5cd3