Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96504da52a7a3a2…

MALICIOUS

PDF

84.3 KB Created: 2021-07-18 10:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 06011f9c28e12a657304c4cf5801db7a SHA-1: c4aa1cc9906be3ae4eb6d756761e39bd7bafa4dc SHA-256: b96504da52a7a3a2b6eaba0ba68605cb099ddccb9c2d4f1b955bba95e44e13b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a chain of redirection likely intended for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8f8644f09---xowapuxudefazu.pdf In PDF document text
    • http://spalovnachemolak.sk/userfiles/file/10272593916.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/jefomisureve.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210618_045227.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/41478464859.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/6h3iqm41qhugrbbnj6cg74qc3b/pofagesezagi.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/gajolizepi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/datojabodokixe.pdfIn PDF document text
    • http://cmepta.com/clients/7/74/74ea2f63c40943e6497cbf70acaf7c81/File/saxanugojun.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/vefananoxoxafijoloki.pdfIn PDF document text
    • https://flyags.com/editorResources/file///64402228602.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/308caa28327f329dda055c8da85b47ee/98328534393.pdfIn PDF document text
    • http://gtshotel.it/images/file/4700339152.pdfIn PDF document text
    • http://rts-3.ru/upload/files/ratonoridozivodur.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c37f4d168---88075428291.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca4fa5fc9c---wogizopawonodubu.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162533466793251200970.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/redarezarosa.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/fuzaxidaxux.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0d3ec1f92---36202562015.pdfIn PDF document text
    • http://malifer.hu/upload/file/jivuwafozovezuzowo.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/43a56afed9a81a31f6e94aa2a8f724a3/15713057619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pityriasis+rosea+viral+infectionPDF 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_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 10512 bytes
SHA-256: 5ac9c14b6aebf5d674d20a880e73fdc81bba3c80274a9c0aa0e400caa2c749fe
font_01_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 18560 bytes
SHA-256: 80d535886655c19468ad3283d557df29b683352cf1b79a712a2b42be0e721d3e

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