Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbcbecf0de48c46…

MALICIOUS

PDF

85.1 KB Created: 2021-09-06 01:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f8e62ce2b7303ab5f30b47948fbbaef1 SHA-1: 52f4e877d4fcd12a7ea3a3e4bb613024dc073121 SHA-256: 8cbcbecf0de48c46b7adb4bf4f409336a33d44ac2d3d14938f9db13c2319084c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files. The presence of multiple unknown URLs indicates a broad phishing or malware distribution campaign. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608670208e0d9---zemalite.pdf In PDF document text
    • http://geopraxis.it/userfiles/files/sesetoluguvogazutividol.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/68596239046.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a869a85934---48450126296.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f299c65381---dipinofizuvegoweden.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/wusaxobogaxob.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/vilusemoguv.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/5165851720.pdfIn PDF document text
    • http://essaidafm.com/uploads/FCK_files/file/gelupizesoruwosiraxa.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/muvesuko.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088fe5e5437e---gaseg.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16085f4b26ed00---22400343042.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/43260803646.pdfIn PDF document text
    • http://hydrem.ru/images/file/gusopazefudidokigodexe.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085115b333a7---pipidapepewemuto.pdfIn PDF document text
    • http://email-database.info/userfiles/file/89505379428.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/71797623008.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/87751826571.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/30053659f94465dd84c813100701ea84/fuxim.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/gedofozoxokulat.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c01c39d3a---92117452865.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/bddfc5f5d18fcf98e6afcc17c3bd0722/54754507188.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0be740038---kuwipanuwusevametiw.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/29145779691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=fortigate+30e+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_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 10656 bytes
SHA-256: 3489a30730452e656d4430290ce3b78f185ac17e37a59cd7ec55e5890d29dd48
font_01_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 19188 bytes
SHA-256: d8f6e71122eb39828bc0d3e79b94b17b965d45fa43f774864098750d9e939949

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