Malicious PDF — malware analysis report

Static analysis result for SHA-256 333b33cf207c5e1f…

MALICIOUS

PDF

70.8 KB Created: 2021-09-19 16:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f45f22dcfa3b96fce3c74ab54561046 SHA-1: f327c673c435eef23bae301b486b4fc3b002ff1a SHA-256: 333b33cf207c5e1fa53749386a0f7da318b70ac89719bde5624f149047cd0106
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://murielbellhomes.com/userfiles/files/21530177249.pdf In PDF document text
    • http://www.pvvc.cz/files/72539505391.pdfIn PDF document text
    • https://viettrungson.com/media/Files/54191127136.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3e823df6---levosuwofujodibusubonones.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/15086681238.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415173dfe4a---xejov.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/89361091647.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/29909366697.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/94323535767.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc5a0a3f06---pukefonem.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/3464231392.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/pexozularonukukexukojikas.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/97276974755.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/fizunomolizojade.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16146aa9da5b44---98879236673.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/26230895387.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/kikexuzavoriv.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/45387848824.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/rakijov.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/49549681571.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/11807707935.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386a40cda62---dugigurol.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4cb74cb271a63598abe28bc8c4196595/goraronutegapakofak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=wifi+password+sniffer+apkPDF 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_off0000b3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F9 16128 bytes
SHA-256: 90dfe50c11b154bb172a123351b223c9f1a279bab0c164754b9d1392f93f2799
font_01_sfnt_off0000ddec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEC 10516 bytes
SHA-256: dca0bcccfc30c63663c16f4f44ddf120bd638c77826982611ac073e426e4c0a0
font_02_sfnt_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1