Malicious PDF — malware analysis report

Static analysis result for SHA-256 e69b41506a23b518…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 11:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf0cca572f408beb0b229bca27863d26 SHA-1: ccf16653ee833b71d030ee337c077e8c2b1281aa SHA-256: e69b41506a23b518523a66837aeb0a39cf460e6e5dd811c48a9d80d1d9ef560e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous embedded URLs pointing to external sites, some hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hiperaktivite.info/userfiles/files/xopipizegozirobeminejixaw.pdf In PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9d2ef366f---kafagoxi.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/76471382226.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/xetutedeji.pdfIn PDF document text
    • http://artediapharma.com/upload/files/38204610130.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/zodibafaxokubowu.pdfIn PDF document text
    • https://videoeffect.ir/data/file/9623192737.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/36634905780.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/fozixobewaledinik.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/6974bc23a57d441780e2af567cf7b585/34720904276.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/wojexe.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/tolulu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b177b7302---34411922395.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/6934526729.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/lonidepefe.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/63973212292.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/24496748570.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/xemuferokijasaki.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/fuxolokawujuwapapegiziki.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/nipixusivafexewufe.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab01a2056f---pusaja.pdfIn PDF document text
    • http://clingac.com/d/files/jademonemivudelekofagep.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/71964786474.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/7936471175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=flash+android+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_off0000b322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB322 14532 bytes
SHA-256: 9d41a5b0cc1eab345d778bed52d980e0f83ef81d2c03583ec6ff7d2646aa9b08
font_01_sfnt_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 10176 bytes
SHA-256: 9b162bf8165d3b933f91fd374b7060e275a6f2afacbf1ad4fda2111c94382d66
font_02_sfnt_off0000ee6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1