Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3068037b1bce62…

MALICIOUS

PDF

76.9 KB Created: 2021-07-30 03:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: becd135c9e4e0457589944c32649608f SHA-1: 668fcae8a31662d337f5873eb93190c9ad99c92f SHA-256: fc3068037b1bce628d16d5784af719a1e7d3093448ec9b68040431c1adbb8c1b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://konsultacjenaukowe.eu/Upload/file/nutuligoxuwilovuve.pdf In PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ft4m54njeo4rl5ntvcfpili3q2/14726890254.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/laxizofefepugefesalikerem.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/cf8f7277980adf7e4a46f88efb1a3d6d/gurulipasegulovazatapeg.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607015b369a78---xewimo.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/nepejipiwavenix.pdfIn PDF document text
    • http://healingpawswisconsin.org/clients/a/a9/a991db820639e3552774ed9a746c1e3b/File/24090955693.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa196f9aab8---93217595071.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607227addf562---tavudinowelasakuzoriwadu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095bd9e3fca8---kusevawir.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/66f13dc09ce155215860d6bb5401ae34/fizuzem.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070a9acab207---93815337928.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/giwuxelajimaweremunat.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/61667603471.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/aoilamgtaoi44ggj351jm2nicu/91722319258.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/84816627963.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/0331dccbfdec7a1b5ff28f349df71e73/lekozuduzetenaf.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/pawebovukev.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tupenakividopobulawilovel.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/vezet.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/zerilawusa.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b6529609b---naxozefemopimorugawika.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/68102205373.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089428374d9f---55746499247.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/zederudipog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=nuevo+manual+de+astrologia+juan+estadella+pdfPDF 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_off0000c79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79C 11116 bytes
SHA-256: ea967c901210f5bdeec7dafc82868c17b953cc06648f1ddd1511c407a65871f0
font_01_sfnt_off0000e145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 16940 bytes
SHA-256: 63dd6fe207bce2b3df9a654968b62e1ae217ccba153aa1f5c003b5e89d1d4f9a
font_02_sfnt_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1