Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f28d36749d897b…

MALICIOUS

PDF

76.6 KB Created: 2021-08-27 22:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73c2527b4bfcadaf80050398896be59c SHA-1: 8f7532b0e6c3ff60f0bf20ee8b59ac396cd4da0e SHA-256: 86f28d36749d897b8a43cfe2e5dc9da68bdcaff062537642c99961c6a67b4824
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://4bzsoftware.com/Images_upload/files/67799011941.pdf In PDF document text
    • http://zeci.nl/im/image/71684740838.pdfIn PDF document text
    • http://neonyazilim.com/images/Media/files/22408666116.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/gixexozenokesusodox.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/64987318700.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53c287c9d---35989312785.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2905786f096059b512dfb834f94c6b94/tamodinetivusakobipuga.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/d219f515c5766e625f76df747d6196de/76112755856.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/kijematogovufotagaf.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d6a89e9973e82356a36c24dcf5f7aa6e/15457562274.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/24932060729.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/nidatuboraveferuperowowe.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hmfkkuvm9a2inumpq7dbrm29g6/jemelefoxalilodof.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/voliselojujofepow.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b980da983---10531199646.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b456b006eb9---7972235063.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b13eaca00d8---3764237980.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969f9c55225---40910616339.pdfIn PDF document text
    • http://beateromer.com/bilder/file/wazaxurumedasosom.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/34695032909.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/56632803446.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/35499805659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=1+inch+diameter+to+circumferencePDF 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_off0000c8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A2 16864 bytes
SHA-256: 82f982792bd8481aa1f3f645c8ebb473ee3e978a58addd8f3648098305ef3291
font_01_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 10584 bytes
SHA-256: a346d25bc9b9a0da5cc4d83c84de3c67dcaca3fcf060598bc337be1a9a430e31

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