Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13b62a73792e0d1…

MALICIOUS

PDF

79.0 KB Created: 2021-06-27 14:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 48b09d9e71dd74e84892a0ff33746450 SHA-1: 91b5713fecd8c9f2d51e6c3d9150955c17ec3087 SHA-256: a13b62a73792e0d16c7adf6abba1d2fd01f408b8def72268ec6bcb5b2dd47977
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malicious content. While no scripts were directly extracted, the nature of the link farm and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/bok7uap10orr7ncqfusp0cg3m7/bejiwowu.pdf In PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4aed47f12---xagumaberumiperisixojin.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/caf7b31fd4a114dc6a86b39aa279868f/80398097429.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/35202032688.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/8fdca00f31497689ca4ae826974d077b/zonigo.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c0156f0b462---56312539045.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/75325576661.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779198db404---notilojumajadesosasaxarus.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/87e7e35241d3cccacf8f671ae5f03d3d/dumigavasuw.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/famener.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/dazak.pdfIn PDF document text
    • http://hrudolf.com/userfiles/54595800666.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b4d26999d85.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/zabiramedavolikel.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/pusaxige.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5ad53125e---21259391921.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160732f6f3d6dc---54491125663.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/zimagafubur.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/51392665946.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/rewimakok.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/ciujdei1ffmg3d5dmar531kg5h/doxut.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec16fa03e4---renipebiroxilaxu.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/sugezema.pdfIn PDF document text
    • http://simonide.org/userfiles/file/womunemibegaramiru.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606da30188455---sarawukufizinix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=circles+of+care+houstonPDF 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_off0000d28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 10564 bytes
SHA-256: de60d3ed268b001974a1b63fa48127148827f1f8fac07a5035823225e39c9cc8
font_02_sfnt_off000102b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 17044 bytes
SHA-256: 03bbc9ba83429e12261646308a2861c84ba7c2893ade8a3e6570c28ecb536081

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