Malicious PDF — malware analysis report

Static analysis result for SHA-256 090785cd7a14c610…

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 02:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d694b698e3d41b3aefec620a0b14db3 SHA-1: 9f405510967cfae021fe2b380ed9bdab817dbd15 SHA-256: 090785cd7a14c6108e162b14f7ca14d16d46ab789f33795bad3c4a54fddd9589
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of external URI links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=prime+numbers+of+40 PDF link annotation
    • https://www.passion-rnd.com/upfile/files/2021/08/02/gozalukakawekavumuzal.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607278bbb6d14---83517881914.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/88500948835.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/37283999405.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/sutudimuxidanemab.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ffaf131f365a13b454729c335c974ccd/wejesamalemesitajubabud.pdfIn PDF document text
    • https://davaocarrental.com/images/file/lusetid.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/82155584850.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16073965184cb5---libobituluworegarujekoxog.pdfIn PDF document text
    • https://yuktogel.com/contents//files/nuzivuwosugebafa.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/59261144629.pdfIn PDF document text
    • https://synersys.fr/contenu/file/59435136853.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/pifojebobesesoxuz.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/76598475201.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/renebupedekitafemipogoz.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bewisovofanezuvofovakiwi.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/mojejer.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/26186057996.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34f3678df3---13490035566.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/xebomadijijadam.pdfIn PDF document text
    • http://dzbnf.com/upload/file///59175403413.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/32370312792.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/20422333267.pdfIn PDF document text
    • 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_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 17568 bytes
SHA-256: 97b5ce9ab251b38476ca822573d9b63f867addad78ed36f68a838cfe57784bc2
font_01_sfnt_off00011c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C65 10508 bytes
SHA-256: db1a86b76711b9047387a323fdb05c5c64090ba5668b1039a809ba40e6014b0f
font_02_sfnt_off0001344c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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