Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25c54f26d9c42d9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-23 21:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc0cb7ed91fa28867697fcfd7257b2e7 SHA-1: 876a957d5ad19dbeac7dd37c9010a8229d84365c SHA-256: d25c54f26d9c42d971ac9df315471bc0f9a727d19f02d323cee71e9ea7763a36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=deer+hunting+apk PDF link annotation
    • https://schmitz.cz/res/file/rulemojafojesopalumij.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/vesobuw.pdfIn PDF document text
    • http://pk.mo/userfiles/file/33609371929.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/97570405650.pdfIn PDF document text
    • https://pindimana.in/uploads/file/28588850558.pdfIn PDF document text
    • http://swhos.com/upload/files/81288978195.pdfIn PDF document text
    • https://strechybenesov.cz/content/sifopezogulepedusikoru.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/rotijonesilijakuvafivoz.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/dekasefe.pdfIn PDF document text
    • http://mega.kz/media/upload/files/91304896897.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/fagibujisiraban.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/39943856955.pdfIn PDF document text
    • http://adriennemason.com/assets/files/95234861050.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/jemamepi.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109131708543865.pdfIn PDF document text
    • https://mollis.rs/files/70094265316.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf0fe65d5---38717294831.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/10756310809.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145c3f4c5c82---lemujebugegopojitenejol.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/611c36659e846a516c7e6e1c1441fa26/25448153490.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/busemakokewefi.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3e6ef477---49770059219.pdfIn PDF document text
    • http://eko-uklid.com/files/file/xunadiletixofidum.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210918_68904218FFD989E9.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/xumepugime.pdfIn PDF document text
    • 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_off0000d586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD586 18288 bytes
SHA-256: bfe0dbd07b9420fe9e2312ca3d3ea92b77501c6f921805c88e55b23397fa4174
font_01_sfnt_off000104a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBD 10392 bytes
SHA-256: 4d00cc84317710a6ab1f8a9dd18733dba7f353f1a791ab2a07a4abd42573d70b