Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20ece0ba1738c2c…

MALICIOUS

PDF

88.3 KB Created: 2021-08-15 16:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4150e3e9504e1dbe9ec79290a3911220 SHA-1: adf7ae75129e245fb8525beae2bb398a86a8410f SHA-256: e20ece0ba1738c2c6b772575bb49af39b54572d261957100e137b48b7fc63890
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 URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute phishing content or malware. The primary attack pattern involves directing users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://rambud.pl/uploaded/file/58922121613.pdf In PDF document text
    • http://abwingsmd.com/uploads/files/91811220799.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0hjjosqlcb5nvslv1k0aqgeavo/geluxekamomugizebaziwa.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9e8f3de1b297cf8621e61c83246ae03e/68080184580.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/85055168633.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/tijiwami.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b805c09258---65790330089.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/kurifofiwise.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3cab27a5c---42140961703.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/e4a4e313de672bc1650ff23805bc7aee/bapojiner.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/00004a6a498240c63ad5aa45241d53b8/79747511407.pdfIn PDF document text
    • https://goodline.by/userfiles/file/lajerilizalefupu.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/zoguduviwepukuxosatonu.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210524161643.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/nuwemuf.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93b98be42---38486507028.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/65748346556.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/60260591897.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/2mk8o1o5dsa97m3mgoo65jmenn/25508415000.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161151073c8246---98614546744.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee9523152---fawax.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1ab376269---pubuwimilozisinujopivosox.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a54b505ed1d---3798393588.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/vubevezonuno.pdfIn PDF document text
    • http://emeat.ru/var/files/1590527399.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/52070086109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=academic+life+coaching+workbook+pdfPDF 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_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 11100 bytes
SHA-256: 49f82e261019e386d0d6f267f3853af49cf2d133385e105f2247a3583535fa94
font_02_sfnt_off0001285d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285D 16680 bytes
SHA-256: 2d7a1c6131d488440c88304463f8dbc8eb9f9156890f7c5b93efc7d454bb40ec