Malicious PDF — malware analysis report

Static analysis result for SHA-256 2501f595cf5f3eb0…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 15:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 78d26442af3403d371c8ad15894e3e6e SHA-1: 7aef1fa183573669fb7f9d8a966c3c62d34c8b35 SHA-256: 2501f595cf5f3eb0f0dd43cb41d7d9e3e057e411dd103ae4102c8d7b48fc28fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs that point to potentially compromised WordPress upload directories and disposable hosting. The presence of a visual download button lure further supports a phishing or malware distribution scheme. The primary attack vector is likely spearphishing, with the PDF acting as an attachment designed to trick the user into downloading a secondary payload.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f363c171a2---47875500008.pdf In PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b9dcaf770---59454960743.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977fa65b6f4---gakuziwilunumubajazifesuw.pdfIn PDF document text
    • https://hojoairport.com/images/file/3412630219.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9d9be48db857c8b837b1860ce6a150a/5841409595.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/448tc4qukhm6h2mbd0mughl0o1/tuwobanojebur.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/ximonub.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884d4ac7472---lelujadopiridujufuf.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b89817b8a---60954116106.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/q8e0806mkq73072l9ffii4pkot/kiwodigevige.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/1122162e91860597a60194bdaba33aaa/21113110147.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/kodamalevuxixubox.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/1339917076.pdfIn PDF document text
    • http://psmpetcare.com/clients/76030/File/xilovutomodejimojajo.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/40990800571.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/34886289019.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/54583324420.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/turikukalixide.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/67432423448.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/degifugejixokiwonuzafotaz.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/4il866ra1fgrjud72raie28jd8/zotirujunesesoximilamaz.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610e87dbba0e9---fonejijobesebadewekano.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/93fca1ae85e05b0ac589a6d5a15e11c0/gimejigobukib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dasam+granth+english+pdf+file+downloadPDF 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_off0000bb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A1 16464 bytes
SHA-256: 3827c4b92c3baf84331d6f255385b7c976be37c47ad3dbbe619da5a36e262123
font_02_sfnt_off0000fe2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 11032 bytes
SHA-256: 00c46297d3da4fc043f92af53ac67c45700e6d54468edcf453bff15dc4a1a2de

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