Malicious PDF — malware analysis report

Static analysis result for SHA-256 c850ed905e3720a6…

MALICIOUS

PDF

73.1 KB Created: 2021-09-27 18:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e5706f914f57acc1b2e5e80f800fd13d SHA-1: 31531886a4bd75a8d565cafdeed0a9fb5f7e3dda SHA-256: c850ed905e3720a621c4b3167b0034cd0588a27b4a2d95293286f52a5e7400b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample, but the presence of external URIs and the overall structure point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3021077noep1dd93p0qei02941/22162791061.pdf In PDF document text
    • http://studiospazioambiente.it/userfiles/files/tejewuxut.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210905040045.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/tetenejixokedok.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/tajizujonejevud.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/bizuxusosajekiwovopule.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/71341281738.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/daxavapipulilurabon.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd10810022---12687405888.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/aenepjck4cci9f340oai2qjtk4/96174850422.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/rijam.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/vavari.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109022005008389.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/mokivagololemurop.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151894ba8337---41753754399.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/91900604201.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/11588748205.pdfIn PDF document text
    • http://aquatherm-graz.at/files/17393221114.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f6a14c142---32473688470.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/90493892986.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/98139983466.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210910_F263CD2402A4025C.pdfIn PDF document text
    • https://synersys.fr/contenu/file/87514748942.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/80206625336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+install+app+in+mi+tv+stickPDF 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_off0000b8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E7 17612 bytes
SHA-256: dcad0d6b8f137ddeb0e0180518c497be82b4859189dfa8140b2a9979806587ce
font_02_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 10540 bytes
SHA-256: 1a9d0aef7011c1c1c336f459c7935021bbbc57e80593c9aa3f5dd3c4837ecc5f