Malicious PDF — malware analysis report

Static analysis result for SHA-256 592d538a3995dd9c…

MALICIOUS

PDF

83.8 KB Created: 2021-07-13 09:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d40fe104de33409378ff9e2dbc135fc0 SHA-1: fc60a594c90cd2cb69ad8a4b328594100872335a SHA-256: 592d538a3995dd9caa6cf46cb27b89cf5ffef98c9ce43d95110c77431a7b858f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external links, many hosted on compromised WordPress sites, suggests a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=how+does+it+take+for+a+nose+piercing+to+heal PDF link annotation
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/1gd7cj58frfnp42e4428t8et82/nopolaxo.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/addcc3555217599e6343582c7b3dbeed/94067959146.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/libivibudigimuputa.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/5tbg0qsc6f88615vp2qmoqahcp/84372678840.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1fa48c98---tiwuwakufukeximu.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/vozigego.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/jezuf.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5702537927---wefejuxire.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/madunukamekewixojomig.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8ed07ae1f43d54795bb39605a651ef07/ganadinesefuvabefavizego.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/zuvubekoxujawujiwopow.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb816c14f---33966662758.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16080895375ca4---warujob.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/b9e19dc5350239d2bfdd52a4758d9e5e/xomuviremowuturi.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/67648966379.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/95ed7d8a56655288dc763a03d9bbee4a/bedebarenivezude.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/mewesibogokijojaw.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/toreme.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/xexavame.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/je7ocatb0r5hhijg96e6t1jhh7/vemitikesugumovojepowe.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9eabb7690---tivujizalelubegopuxim.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/rigipejilatomefel.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/mozakelaropix.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_off0000e602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 16248 bytes
SHA-256: d6ed2e47ac2cff4fce413fb23b8e825e53eac434a94e00f62beb513dc4e58eb0
font_02_sfnt_off0001280d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280D 11068 bytes
SHA-256: 138d0dd9829c23b698514dd9dc4a4defa3575e5385d416fd3a94a78603b27438

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