Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba507b698382700a…

MALICIOUS

PDF

71.0 KB Created: 2021-09-08 02:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d78926d770348273f30c62fa0ca56b8 SHA-1: 3beb4690ddfc25a9663f2f677053803976e5b828 SHA-256: ba507b698382700a337a26a6f83e25aa9e2ad632d03e8628c0435be65085da28
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised or malicious websites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The embedded URLs suggest an attempt to redirect users to external resources for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://giriconsultancy.com/content_files/files/52789910965.pdf In PDF document text
    • http://allprintusa.com/admin/images/file/37904151059.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/xujaxiwowigazejuvabim.pdfIn PDF document text
    • https://digiconelectronics.com/media/34172497459.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/68528109361.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/45123902544.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/55263154067.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f587edc04e9f17461705bfec3723e403/70876986675.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/13617961924.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/pupanekupuvo.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/tonobubef.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/b8621668f6fbf64c43280847fe9284c3/23421997988.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f431bbaebe38ebe9eb24cd6c7ce97263/kakobopomexomeka.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/mitamozakoxedez.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beee606f5f1---82900654620.pdfIn PDF document text
    • http://uco-kampen.com/media/files/64016924933.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0e0c3c295e27aedc8bdb28a8ad2b3df/59472711245.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/82588110413.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d1b698b6553fb6f5d49328b897aa4774/80568994356.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/49471602300.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ufl135mq0d5edgo0dv679m0ei0/nuparejom.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/72727505390.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/77841247143.pdfIn PDF document text
    • http://rc-modeller.se/images/file///25499701090.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/f689af6b0c78025cde0ec2afb80fcf4d/wevamizolesumetuwemezimar.pdfIn PDF document text
    • http://cjatkinson.com/userimages/75482375515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=friction+practice+worksheet+answersPDF 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_off0000b6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F1 15540 bytes
SHA-256: 71b0bdc02d7ab75a2f1d7c43a75be3a9fdf8fd15d4b1623970b796744b97586f
font_01_sfnt_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 10580 bytes
SHA-256: 7ba5b7aca426da57c755184fd3d5a1b4f09fe74d8d886f8011a4524f87ffea71