Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da17b19c9ff01ee…

MALICIOUS

PDF

77.7 KB Created: 2021-09-14 03:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d62aa7a5990c879ca8662199be284b1 SHA-1: 86997833b9d3bb8607fc0907be0e450c08aa96a3 SHA-256: 4da17b19c9ff01eef365084c4a53b03175ad14a1d2d4f6d33175ce2fc3b29f54
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document attempts to trick users into installing a browser extension or update. Embedded JavaScript streams are present, which could be used to facilitate this lure or download additional payloads. The document also contains numerous links to external PDFs hosted on various domains, some of which appear to be compromised.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ryokanclub.com/FileData/ckfinder/files/20210901_E4CD730BAA9FA82A.pdf In PDF document text
    • http://infrabud.eu/fckpliki/file/ladajinanupedojufato.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/wizijo.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/nudapobelikiwun.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/bf5921c0598356a627129ef8eeceb1eb/lalifobusutupuromolipagan.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/fetosapilogumewopipimu.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/58662478176.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9b6d2534---24759692927.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/69421276015.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/56901106387.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390da88a4b5---rexizavozutalavozijawife.pdfIn PDF document text
    • http://ceroki.com/image/files/ligarulozu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/eb6eb41926869dd12db25c11cf90d9bf/nogifebikav.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/22183369933.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/ritaperexigegonivatef.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/desovapufijif.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/xavupupagofef.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/sizaforesozib.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/98821251638.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/87848476549.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/61559890256.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/63625891156.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613213ecf1a89---14492678055.pdfIn PDF document text
    • http://client.diffuse.info/files/75701858306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=among+us+mod+apk+mapPDF 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_off0000c4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C0 20304 bytes
SHA-256: e28358fe2b7361992bf0aef26c2509282dba78454415dfdc9ff26b1bb82ee0ce
font_01_sfnt_off0000f98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98B 10440 bytes
SHA-256: 49fd8c0d7207fff78175987b36af64d61a6a35f88b1a8dcb93dc1b912347954c
font_02_sfnt_off00011105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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