Malicious PDF — malware analysis report

Static analysis result for SHA-256 228f6b23293b956d…

MALICIOUS

PDF

81.7 KB Created: 2021-08-15 02:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 84846e8fe6f87d907b4f273a87d109f1 SHA-1: 895034cff25534fcc01553b6c22bd6176359a58b SHA-256: 228f6b23293b956d1fa2e3ff7891d4412edd9d2fd32215241d4276e2cb1c76e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or lead users to phishing pages. The presence of multiple distinct hosts and URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609780e307e52---80972924961.pdf In PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/tevodetidubewawepabeber.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/sijefutarenu.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/99740411023.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/e4aa5b69ecc88235a7c0829699aeb471/15675642715.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waluzusimin.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/76605194232.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/9b829b7a1c8c39faff6affc2e58e13f2/65958819589.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8b88936ad13b4e1aa110a8635c605ca1/ninegutatugumijejevolorut.pdfIn PDF document text
    • http://tyextractor.com/d/files/24809683158.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/55762688998.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/l6bt5jpfaatvn02dsofsro17g4/68993860644.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a1799067d---14407942693.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/wigufarisosebuw.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/b9edbf49755d9c07cdaa25133100ec46/suwalozupugos.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610f39481adce---zegugixan.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/bajurizewogepuxifapoduba.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f5168ed86---kifepebediwewuxo.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/176ed4b7e7b7e6cdaebf40ba51358ef3/43887837913.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/befosuleriperir.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b1c53ce88---bavupaxivum.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/k8f4lifepl6s1tuo1bol4b6lld/49853252179.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/o196n0fh9hllhi9fo1nctgms2m/zurarezafanojezesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=international+stamp+price+guidePDF 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_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 10908 bytes
SHA-256: b75632e8c762c00103bbaba9e2647fac8c0de796bf4eacd9c44aafd46e945cf4
font_02_sfnt_off00010d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3E 16872 bytes
SHA-256: 92c6a79ff1f89ca15cdf1defc931527cf965e6e658ae67cf26d8ea74a18469ac

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