Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbf8c41111e0e26…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 22:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46c8a6f4ad47fa99a61052fe112467b8 SHA-1: a6c1c409bfad8dcae98946c7e4978db529a29fea SHA-256: 9bbf8c41111e0e2629a3dc8641fd53e0fa2be3164d7f1518c0c8fd2fda24ff28
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress upload directories or disposable hosting. The ML classifier also strongly indicated maliciousness. These factors suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://banghenails.com/upload/file/goxovexijepekeg.pdf In PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/118d50fa9f54deeabdb7b19dad9c33f0/xoligel.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/82037042303.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/61594390396.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/gomojerizakarogovalab.pdfIn PDF document text
    • http://unsersohn.ch/images/file/14955013287.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/73364b66067feeacfea0b864274506b7/91858629159.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/sisatesoguvimepuwivo.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/liwevow.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/gixasozuwafugov.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/lebuludif.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/pofekagitebuzexuj.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/32312032640.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e3ae1f56bc3c5341e4a8c7a51b0a0678/77973856731.pdfIn PDF document text
    • http://llux.vn/uploads/files/24055911754.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd293af76a---60193430789.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/65984996630.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/gewuti.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/02215033993.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fed6b44a2---68264412699.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8d7a967598985e8c6c1b18eb8b1e529a/27147169709.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/mujodixotujibabuvuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=manual+driving+lessons+western+sydneyPDF 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_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 10784 bytes
SHA-256: 578ab42e610d813e00b2de120ef7b9b01e49c4d5c08bca64108623e1298ec1ca
font_01_sfnt_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 17680 bytes
SHA-256: bf829b0185585ce691a9b4987e2367e7231adfaee1073a579b68ac7b0f7945b8