Malicious PDF — malware analysis report

Static analysis result for SHA-256 90470c9167fd7fef…

MALICIOUS

PDF

93.8 KB Created: 2021-09-04 06:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 445c62cf3d429128ae90a87f095289b8 SHA-1: 0dadc006b31db1e70daea2307d3d7a723ddc5fc4 SHA-256: 90470c9167fd7fefcc2164c982a52abc7b395520fd85df35b11f240c636b55cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous embedded URLs that likely lead to phishing sites or further malware downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=westinghouse+freestyle+multifunction+oven+698+manual PDF link annotation
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/folubukogejejejudobimem.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/5b0f3bf19f62423fede654d3dc57471f/nasupaxodelolunomej.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/4f7lf2k0vb8p57qtvc5vflasj6/rakiwarizarunada.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/9fp0566e514tocr38li3v7ebgd/8857771875.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf3fe9cd7---31054908806.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/44172112542.pdfIn PDF document text
    • http://www.heksan.com.pl/file/3372320708.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/37070357098.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/kixulugafisomalabeneten.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/76311422901.pdfIn PDF document text
    • http://short-story.ru/upload/file/jimokogewojix.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/82451400433.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075f16d82bc6---60466917399.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/18842280215.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/21899869016.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/18524327879.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/46532166367.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076457e4a22f---xazowudizofipe.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1a2424a9f2e0a1e90485f27a5cd5e8b/94674728134.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/68503269752.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/dakudemigakimemiwo.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/savelasotasolunupovenu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/42965cb4a2af950724df9a1c083821bc/96809913858.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/77340872016.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_off00010382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10382 19116 bytes
SHA-256: 946d4ef8e4dbf649e851fb0d9856f645a367edab1486a56963dc7291852b24fa
font_01_sfnt_off0001358e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358E 11600 bytes
SHA-256: fb04efbbd0cf7860f5784612feb497257c82f3f7762cebc1570478a8e5421eff
font_02_sfnt_off000150f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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