Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b48224d68342f4e…

MALICIOUS

PDF

72.0 KB Created: 2021-09-01 04:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0582866f6f12e750f65a1107395a805b SHA-1: ef1328603196192c35a0107cfeaf04c1633bb6e1 SHA-256: 5b48224d68342f4e9febab409094d36c9fab50f824949036538780b13836df8f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed for SEO poisoning or phishing. The presence of multiple external URIs and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://bigxra.com/uploadfile/file/2021070606440173499.pdf In PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b5f2b121f6894866851e6abba6069e60/sozobafi.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/tugotujakaxuvutomutaw.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/mivelogujefomape.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/sevaz.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ps9cfh8o9npnpjoeo05gsmoc8l/28327505298.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/zufowokifutinelogadum.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ee000eaccd2---2520594923.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/8772163634.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/51396533686.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/9s2rfprv95of963aae0o4qglf7/47900158773.pdfIn PDF document text
    • https://matratva.in/userfiles/file/jikixovusilo.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/materufugo.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/36532386594.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad04ae60c12---3464214899.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16079d855204c2---kibopuxewododumelumukudop.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/01e83078fe6a65dd6f62bcb42f8ccaec/67162004390.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/25403690523.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/guxuxupumevativaxas.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be94b19515a---75254425026.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/64743888179.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/rigelologuwesujiwitezo.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/napupusovapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+free+porn+game+downloadPDF 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_off0000bb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD392 14976 bytes
SHA-256: bf12a5001ef562294da9b72766a0471f4d0ca8dba10b5910a48040edd69585c1
font_02_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10644 bytes
SHA-256: f70705eccc2cf71bb201538bc801a8438bd8c6c65020b715bc3dba780685d27f