Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b8e4ec4d0a2a9e…

MALICIOUS

PDF

83.3 KB Created: 2021-08-27 15:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 059da780379b9e6c80589d99857f29e2 SHA-1: 7abd8a33ea64c3f002b1139f79290f556f30a899 SHA-256: 16b8e4ec4d0a2a9e4b5a33fa186d7ed1e2c5c834eec93a54a9e03a4803198a78
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf26de2b104---67065882301.pdf In PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/14270544041.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/kodujuxiwijexa.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/26360798961.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/lirumijosibi.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/pamukatowawejewajijulum.pdfIn PDF document text
    • http://haphadoor.com/upload/files/tobopizo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f89167c6---susoladawav.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738f932f775---39496476548.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609236540990f---45167540468.pdfIn PDF document text
    • http://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/xakanomubaduwapodegija.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/57835712468.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/v3q7to0u20b8htm8l0pu8fq4ij/89490078666.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/botam.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120b27b9722b---56799370254.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/76080457298.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/sebugabatexas.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d39fde051ec---wefabewekeba.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/lovirevosozopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=neato+botvac+connected+manualPDF 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_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 10452 bytes
SHA-256: e203c5bd18ae207e253c2474785cb47266c39fe5c684db4af0cfb622d1cec249
font_02_sfnt_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 21820 bytes
SHA-256: bfb1cae4dee919891d303175a92883d79c9a1ed31dc7419e8d668c4730dff3f6

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