Malicious PDF — malware analysis report

Static analysis result for SHA-256 078ef2ec6c43cd70…

MALICIOUS

PDF

89.6 KB Created: 2021-09-02 12:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd263eb883547e16a1358329f8348127 SHA-1: 0a728957f0766ed108b39536c2c49bf14cc59d9e SHA-256: 078ef2ec6c43cd70eae6786767beb79c7e517fd0757d97b3b811724120776ef7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Several heuristics indicate the presence of link farms and external URIs, suggesting the document is designed to redirect users to other sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.rapn.ru/ckfinder/userfiles/files/18798097730.pdf In PDF document text
    • http://wib24-admin.de/uploads/file/68105259660.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/jifofu.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/bonexirad.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/46530433985.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/49162292808.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2511bbf5b---30582349635.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082addd930c5---68126892511.pdfIn PDF document text
    • http://mp-journal.com/media/file/6467528992.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/78565955302.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/zajaw.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/wulifipevozajanuzofus.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/aa8e350cb5e3b9a1dfe28f2c0f196259/nipajo.pdfIn PDF document text
    • http://kaies.net/upfiles/210825131754093296gvu3zm.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7e19b886---99257729789.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/167c0c8f987734c4cb7482ef252e01b9/doguzobaduvu.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/69174507985.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/rotujegamoruwalavadole.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/geluwajopajafab.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084073c634a2---49600359515.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/afkg7h2p6h1ipmb48f5o4itbf2/gerev.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/gufuzirudeluje.pdfIn PDF document text
    • http://dentherapia.hu/files/file/35435997656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hermeneutika+subjekta+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_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 22256 bytes
SHA-256: 2058fcc57b83c141aaa371c373d9a30250f8a6eea676349af08ed858471f5cd2
font_02_sfnt_off00014082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14082 10948 bytes
SHA-256: 80c487977c29828f0c07b16f316a76be4e91646a13ca532108d072c272970579

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