Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e41b45d238a9cf5…

MALICIOUS

PDF

90.5 KB Created: 2021-06-29 22:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: be4cc771d05f4da52a2c29ab5e066114 SHA-1: a424e8dac114985168c05fb438e01c515a2b76b7 SHA-256: 9e41b45d238a9cf5a899e27651aedb667418fbd2f59c002176e860647eb69ef9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://contactfm.be/userfiles/files/88815643956.pdf In PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/98240223752.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/41682987060a242c63c707.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/20298185689.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/65842797311.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e57171541a---tulapizukosezanubugi.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072252ff2dbb---venoras.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf94e10b1---butoloxekofowenekoteje.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/27764133371.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/82067635955.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/75875867979.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160842b244c9db---55190096602.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f350d9cf939d19a00cdc102a97210d58/6029663691.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/srnlrufvicn5ku7mucngpisamd/vosufimixoxelosas.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/tirarelorokonusugojus.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a785ef14ce2---66291320767.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/nosuguxosawemojebij.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/guj869d6bq0irnpg5q7ma9itg3/46357855074.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096025b3ec2d---16865162636.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/jagikiz.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078805b60994---lekemifiv.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f2291d0ef35280c312b6393ac5a54593/jikijimemipipivedu.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083953c6b6b3---panegadine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=adverse+effects+of+antiplatelet+drugsPDF 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_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 17144 bytes
SHA-256: 7aab23ca727b86fe023d4bf6155b113fa9a01648ec60fe0f8a51a9653b8bcb1a
font_01_sfnt_off00012b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14377 10940 bytes
SHA-256: f8a48a9eada75fe4573bd20242be5f73fd662643789ec3d725413778dac99404

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