Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b3112315959d6c…

MALICIOUS

PDF

103.8 KB Created: 2021-07-25 04:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b9fe5a5340af806c56a02e966297902c SHA-1: 818108c103f32d528050c654550b77f8fdfc1cd0 SHA-256: b6b3112315959d6cb98dc61817e8ffc0eeab132430b2816af40e260f39b83e98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607de28fe995d---bemovedexarijune.pdf In PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/f50qalhc1t4b5vsbaa2eenl8o2/3504956175.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/guveno.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b167bb5f3b5---98143080357.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/6a3860488df195270458099908aed81e/80322211293.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/97gg6pbc9d8rpg4si9ee4j8hq0/vobobe.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/sawesefuxolofojomosagifit.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/902afe7d49db98cae4d243289d2af22c/52187528811.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4952ebd346---78548866989.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a4b045ee55d007f4a522773a3093c1e9/jemedu.pdfIn PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/18255667265.pdfIn PDF document text
    • http://neenah1976.com/clients/17995/File/11768483572.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c11529340a---zekowamekoviwara.pdfIn PDF document text
    • http://for284.org/clients/7/74/7452b259410349f427184d5eaa48bde7/File/89280991701.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/limad.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/viwifufizasawaserumenov.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160be687c3e97c---dibiparigixifomijez.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/82337578610.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f69e2d3c766---31314812089.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/nogakisatipa.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/fujimaforefedete.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/11343384924.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/54557381767.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/nozegipadatuxuzerixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=livro+geologia+geral+viktor+leinz+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_off00012d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000145a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A5 20088 bytes
SHA-256: 408a8123672994ee2cae2b858d2d650080aff0aee72dbe1b50da6fa6ca53cebe
font_02_sfnt_off00017726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17726 10680 bytes
SHA-256: dadfb060e8dd943082e6bed3e4fb29af7e1a3074b1ccd0217b671ceeefb57b69

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