Malicious PDF — malware analysis report

Static analysis result for SHA-256 4343b9149df5eaf9…

MALICIOUS

PDF

90.9 KB Created: 2021-08-09 06:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9aaf3b83bbeec65d16d8966c7128dcc0 SHA-1: d5da3270f544c8e1e2c470dae6c602c6a6ad3752 SHA-256: 4343b9149df5eaf9b0672903efbcfd3e013998adbcc6e0514e2158f569c0a47e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and a link farm structure strongly indicates an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://appartenvue.net/appart/upload/images/xodemibitidosesekidopojiw.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b14a18441fc---nojupipotutojivafewinutun.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/b6a2d808bb5164cde5ee3ede52a6e22e/masipuw.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/nuxeboxot.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/zopipa.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160db9ed801e6e---xudisazapuxu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/q5m60brl96jlb33n25np5pklea/16898516495.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/6ue8fhgud8afrmk12qek4bt046/59987636954.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/65443557087.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d98431a6018---39461809222.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/91095338004.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16099703867ca3---79147306669.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/91026ba018891e24203b32913cc2912e/74460317744.pdfIn PDF document text
    • http://sepremprod.fr/www/images/mediamanager/vanabovavosewa.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608afabc2d859---41466815402.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/8129dc5b7ae20dc5767281bbe605ef0f/ferunako.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/wivejajajazisefudozabisux.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608720d78f381---68195424072.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/ridev.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/57787471987.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1b6cd5fab2136f338178ed5782d10326/15176639846.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/352b1e30f6c9a971b9ffb8aed6d3f6db/xulakozuregidakizugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+program+a+culligan+water+softenerPDF 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_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 11000 bytes
SHA-256: 984e76240545bca8e9d666ef7a47ff134c0dfd7f5c63eb5469f8f1da434717b2
font_01_sfnt_off00011888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 17416 bytes
SHA-256: 8121513747d012bdd07652d5095890fdd02114ef31f98a526f7d14e0c76302a2
font_02_sfnt_off00014653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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