Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9851d7fd9d6804…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 16:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a67b7871a239e464b60adbb876e63021 SHA-1: 5eaffd226ed5c7b350fee08ffb4aaa4e4ef82b3f SHA-256: 4b9851d7fd9d68049dff367e733c9acf62bb10f1b41f0cd5fe25abec36f84568
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://libertyrealestate.in/ckfinder/userfiles/files/woboxojovagipabukaner.pdf In PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631335842_39554bfa1d.pdfIn PDF document text
    • http://muszempilla.com/files/file/totajuti.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5a894bdaf---lexipumilufig.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/22059277123.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/pasolijejo.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/0795901b7d1440e87608cba15da44fac/bobumuxa.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/28523856501.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/59705276186.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161426d55715d5---52007525545.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/16103184441.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/kewajakusemovexugog.pdfIn PDF document text
    • https://parc-hotel.info/file/99122981389.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/13322472073.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/94808243990.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/bajukoxadisigipezuvumemi.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/50421199025.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/76903701932.pdfIn PDF document text
    • http://www.polni.si/Images/files/73437599255.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c91a27603---4917245969.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/bekewogakisolemoba.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140e52fc6808---jiwokexudinixofodo.pdfIn PDF document text
    • https://udruga-invalida.hr/files/46270048907.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/b0icukq19895h55lt7lhbvf3j4/vorimilesubenaribujam.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/lojoberuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=my+lady+boss+marian+rivera+full+moviePDF 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_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 18736 bytes
SHA-256: 1e1c067d029ce6e1ea66c5781e864d6320308da6b0995880ec568ec622d1ab02
font_02_sfnt_off00012eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB2 10832 bytes
SHA-256: 9135d54ff1bbc29b1681b44ff0935d01df01da4329b50c0e798dc01142b576ca