Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1ea12f5d4da6f5…

MALICIOUS

PDF

90.1 KB Created: 2021-09-05 11:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01c4b34123ef53e52769c3b9c1a9a4a4 SHA-1: 9a67837935539298b9d80823ff414caba77c2ed5 SHA-256: 8d1ea12f5d4da6f54766c4e44d705bc7345fce7e1d965c2385a03701fc60f8e9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on a variety of domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple link farms and external URI firings suggests an attempt to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://box8websites.com/ckfinder/userfiles/files/kivaxukakebexezikijunot.pdf In PDF document text
    • http://abbwingslynnhaven.com/uploads/files/65097676196.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/teduvebezij.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/lujogabujejezedofi.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/vusokurebapomewimiwijotov.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/lomobumitufavekudaw.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/35652525750.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210804112630_xk74tg.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/31124649989.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0afea784bc---daxedid.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/pudawid.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b558105919dd4e55bd5226f990379bee/tuvukipiz.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/pamesotetivazonobe.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ede32a38e13b960562ffaca4712f427f/69118368649.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f6d35a0c23bfce5366daddf8ba1509c2/pofexunowefowu.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/70116766104.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/95260345214.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/ralawexigonobazazijaligat.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/gosixodobuzulidokemava.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/58626975449.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/82478807413.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/milerifore.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ln4q93j1gp1vlr4tr14vaj7l0b/ganobigegekipafamopo.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/99790350362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=objective+questions+human+resource+management+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_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 11628 bytes
SHA-256: a2242a05e7d4f6d3a1c43784228f56271ef341ba9fb1f6c0ed5155fe5358eca3
font_01_sfnt_off00011550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 17528 bytes
SHA-256: 10791a8ba30d15775a04353232b4f7aecab059d70a5b6298a45b26017c323b8f
font_02_sfnt_off0001422b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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