Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6b2c38d06273d5…

MALICIOUS

PDF

94.1 KB Created: 2021-08-09 21:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ebe7cc99915c2e2db63603df8d6a2e19 SHA-1: bce71d467eee25e1999842a5e4d8c31afaa64e72 SHA-256: 3b6b2c38d06273d5037874bf3179c6d52798b9e735cf13ffcd62b5e461910f4b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting it is used to redirect users to malicious content. The presence of numerous unknown URLs further supports its role as a lure or downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3624ad9c75---54549177718.pdf In PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/104a6b2025e49cf1264b8b2401bd54d3/46336874870.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/8m2na6iodtm474gfjml6m07tl3/80197974792.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/536881025.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/87826283679.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f95f676561---natalum.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160933c925bacb---zufexekamodivonezo.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/wuruwadexopatuluzek.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/xivuberiwe.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/59923481916.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de8ad7cfae---fuseg.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/fukodekaw.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e16d9db7733---vivujaselolivuzozazagez.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a328dede6---komemimi.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/30479907040.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/34957150461.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/wivokavinuwozakum.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7fbe7299d---2496517817.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609100a00c175---55135259615.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/dc53f0953cb8bfd3c848fbcda01645ea/53113486177.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/ritekapusefor.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/af9f8dfddb147b6eeb39fb853c279e44/94368097475.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/jufufajifesosuxaguwipu.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/19427415738.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/65846064049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=whirlpool+convection+oven+not+heatingPDF 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_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 16900 bytes
SHA-256: 1e24d0c12883ebb6475d701452b00dff8e1afa397c93db3c2bc9538d38add78d
font_01_sfnt_off00013858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001506f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506F 10544 bytes
SHA-256: 063d2c37e452d6dc492b745925afb9318b9a27e32dd92fcbe304d9cf177cd1a3

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