Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6e26fe78640a36…

MALICIOUS

PDF

86.7 KB Created: 2021-07-03 11:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8a52a18aaac34c47fb6beb71341b4277 SHA-1: 71fe660cac0e401c9cf2fcf85ddf4be182198dde SHA-256: 0b6e26fe78640a367bbe7cf4fe0c39cc9d9470eebee6a55ba5eb28e935f1581e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the overall structure strongly suggest it is used as a lure, likely delivered via spearphishing, to redirect users to malicious content.

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://catamma.ru/uplcv?utm_term=the+new+psych+movie PDF link annotation
    • http://sparkpro.lv/content/file/govixulavadubolekuliselo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2fd6cf6f7---zameziposaparolojudirom.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/nuxowifobubaf.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801aaa3cf0d---45188794999.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/nidojadosokudodubakapos.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/925f95e8a32fe4c1853f95a8b54a4f68/leguwasoriwibolu.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/98541000622.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aab7914ead---gosabo.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a2bf0856---2925033411.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb785b97f27---91928119753.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pasepanenoxuwudusupin.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/82978803633.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/qcd5hst9m3mnrvhca8pjtdv1n6/58589341650.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/sunetexugiselerinewaper.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jqfcv3dkg55s7i9gc7ee92rb7t/51913202193.pdfIn PDF document text
    • http://etasystem.net./userfiles/files/64618896936.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/92434007425.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/86699e08da859bff68cf0d4fa770dcc1/97262858462.pdfIn PDF document text
    • http://indecomavo.pl/inc/46965728679.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/25ead6a65067279631db99b9313bdf9b/bofarolexituzipa.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/57467181293.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/0fb9077efcda45690e4d41814470e96a/61158154467.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/vgg4ugqk4hfus1opmcntf7kc4f/43096013148.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/v2qv99ilnpn5ubnphrnplrmdt9/84964010922.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/tomupe.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_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 17748 bytes
SHA-256: 36e2b3fcb716f8bfd0f3157aeba0c73a6d6d4b134500436af97601a7de47ca46
font_01_sfnt_off00011ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 10460 bytes
SHA-256: df38222c477458c88e1bc2a80692679a5d0270137966bd1da0922ff844503ebe
font_02_sfnt_off00013444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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