Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3bc05c4177219d…

MALICIOUS

PDF

77.5 KB Created: 2021-09-08 09:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e919c94ded6e6d55f7540920bf30ab98 SHA-1: 4ebe2a76def719da2d5f47f011da84dc34c8f4c8 SHA-256: 5b3bc05c4177219d809a1e0ba984dd36e33a4649d4763be0e3d67d0cf28c4957
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or facilitate phishing attacks. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a malicious intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=centre+worksheet+horizontally+and+vertically+excel PDF link annotation
    • http://agnieszkapawlik.com/userfiles/file/12367169400.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/fibamodobarofa.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/46916863024.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1611ba1d85ce31---24890657193.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n6f42hnl5b8ottdvgf16us3qm7/87513255125.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37262e2083---54880449976.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/sogovero.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f113c0d80---81568300448.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/393da5cd932645a9a94b47d88de0c5f4/61564836256.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/55896539025.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/15bad20177bf5f105adc4d54754d9c05/48408961894.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/popasetusosujojuzul.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090736e0274a---tepojuxakug.pdfIn PDF document text
    • http://ashioke.com/images/library/File/fakobo.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/78817533700.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/bupifuve.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/rlbu5fg1cc81qt7ota6568ark3/wazebixemonipuzuxiz.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/fememuboxikogemilus.pdfIn PDF document text
    • http://zeci.nl/im/image/dopaje.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/6996fd2a3b5cb34545f2775a4296c6e0/pofumigikef.pdfIn PDF document text
    • http://hanleyresources.com/images/29303125581.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/6b5e227a500030c3e76f737783edd683/botuvedafem.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f97fa998c59---xozapinubasexujupifadupob.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/refuludotitelazikuz.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_off0000cce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 15924 bytes
SHA-256: 6778f059649db4e371d5a055f2e2a9977ad3d631a27f7a52fa191f7a42ee6bc9
font_02_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 11016 bytes
SHA-256: f57a7694c0d2a806a15aa000c8ee84e00d1c7d255ee1467add7ac9584ff851ff

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