Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c00ff994ea9a1e…

MALICIOUS

PDF

132.3 KB Created: 2021-07-03 20:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0219d3b2ee91b92a4a1e175ca7e8ab13 SHA-1: 3b52a4d51e01812332f94b6bad944b33447c968a SHA-256: 86c00ff994ea9a1e78fe4eeb08041bd97246482369a11cd95c81f8d05ee58874
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host malicious PDFs. While no scripts were extracted, the PDF structure and link farm behavior indicate an attempt to redirect users to malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/nafub0dkeni3hffdftmpbivsrl/sejoxozojevujatuku.pdf In PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087766b96e20---59880883747.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/dd4tcql56lulrp7lqbbaiifvs6/voxusoboxurugasos.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607648ea772b8---50530530237.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3ef9752e247c9512d2365cb69b311f70/tibeturenewowuti.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/smfp3tg2ph256i29qtjq2t8vj4/19560700087.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/835f1a9f5c19d17fec095e9b3e8052ec/viwububeninibipibig.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fadaaee0bec3b9d89fa5cd9781d0e410/dakikubopiruk.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbcc33f651---biluzeko.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/25329974789.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/76520999658.pdfIn PDF document text
    • https://actorconseil.com/files/file/dukupiwebirawivezupoture.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8841f67c91---kavuxeroga.pdfIn PDF document text
    • http://renovator.cz/files/file/kafim.pdfIn PDF document text
    • https://eucolait.eu/userfiles/files/25284265833.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7023c65e4---50912021766.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ede2884a87fecd2b2858e887d76ba0da/13995638304.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/didolinilabupa.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/25773515520.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18c2dd7b4---luvawi.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/rcs8k3vvokdupt2plh922s09k8/xezowobojuwupozuva.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b14920e25---ketexasi.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/susumuruzopi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a167d2f422a---14075393040.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/dopedoteji.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/76pm4gcoko2i8j3cc3shmqu2o7/nimifaxuvojuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+songs+for+caller+tune+in+tamilPDF 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_off0001a5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5E4 10832 bytes
SHA-256: b7f148f160b272526c37b892299e62cc20ec043cddb7b7662d52e9dcbe8850e5
font_01_sfnt_off0001bee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEE8 16932 bytes
SHA-256: 1754b698b131d10f7b2da7d8af84631f20ead217cb59a2c2cd709b6f63299d28
font_02_sfnt_off0001eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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