Malicious PDF — malware analysis report

Static analysis result for SHA-256 627005562e8a1a9e…

MALICIOUS

PDF

74.8 KB Created: 2021-08-18 02:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3fe43a350fa5ff23d285aba8e384abb SHA-1: 7e72b54ef93052bb89f24caf1811dc31d7d081bb SHA-256: 627005562e8a1a9e29643dbe9d5558f6d7bb278dca5f856b5b86095bafb0d437
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this is a link farm, likely intended to lure users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://nomylo.ru/uplcv?utm_term=benim+hocam+%C3%B6abt+edebiyat+video+ders+notlar%C4%B1+2020+pdf PDF link annotation
    • http://sicompk.com/survey/userfiles/files/lidawuzixul.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/sapenutuxo.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160926c4e51cd4---38732917670.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/tomcs82avureee9cqmtsle13f4/rofafavepu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eececada6---tutibezozivitozekadudazon.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/vedodanopevola.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/pijibefoxojomoxagoxafaben.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077911980b9d---walakulixubedisaxejivu.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/29216712881.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fb32a37bd8d410f2841804407c890e32/5442092849.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d00240b8a---dadefeb.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/mudixomatijetuzuve.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f8ea338a---gitel.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/nrl2vooa3scfhm87va4bt6i4d5/39399420145.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d9cc18d86---nikimewuto.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f19b6ddf01b3aeeda28a9efc468c4062/gekafawifatoge.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/25207730921.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/bowolu.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/jovodufujuvaretojodivujo.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/58830598189.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/9c856fec841e79b03e43d86b0b226dbd/lesodizo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2f81d7e6---wixajukafi.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/56792323428.pdfIn PDF document text
    • http://absigorta.come/file/30024412178.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/xapanuduzepelewuwe.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_off0000bb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB15 17920 bytes
SHA-256: 8a2e782f220c61190d565816f39f1bd70470bd1c98e864fd0effb1d87510e92c
font_01_sfnt_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 11760 bytes
SHA-256: da2088b25d29e63a46efe5e66bc03bfdcbe62a81b63226f363fa8cc2a1286fca