Malicious PDF — malware analysis report

Static analysis result for SHA-256 17bfd6c9bd0af7bd…

MALICIOUS

PDF

83.0 KB Created: 2021-06-29 11:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 25d687da55e9cae3ea03bae33767a6ef SHA-1: 5dcf6e7d6eff76abeb15660b526a53d71d24fde1 SHA-256: 17bfd6c9bd0af7bd7ffc655f19727afc0176b86f6adcdb5a3cd67a9ab4baf83a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://bluekeydigital.com/images/pic/file/45530965975.pdf In PDF document text
    • http://w-f-l.de/user_img/file/ruvolazololo.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/pagugajepikago.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/33916671510.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/josiguloxeriwavokavazonu.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/pvo4r7hvur1gn6nk27jffhqip0/43709077566.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ivk7p982ohf5pmhddvbtb63v38/95239670109.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/20648852439.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/73ea687194cf1f62d2c3f9fdcc927973/godimajinofuxurosazibif.pdfIn PDF document text
    • https://service-panev.com/userfiles/3480779051.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/93861012941.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/mibezesulevululeveludu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a6169e1dc4fb5712e6712a36dc8ef445/65499133559.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/23511449597.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a81ce70fd1a---visolulu.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/99651650502.pdfIn PDF document text
    • http://kpnamboodiris.com/userfiles/file/17838204287.pdfIn PDF document text
    • http://atya.eu/files/file/23953332176.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1rsf0k82mfjvg5v0d08ps3l117/miwaboke.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/73598235502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=commercial+litigation+lawyerPDF 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_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 10636 bytes
SHA-256: 2459f679907d499de70bf3b0228e66e5b1e57014214405c211f19f276bbe4131
font_01_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 16628 bytes
SHA-256: 051f8b847c216c60375cdb5d5c3cb2aa979e93a82ecc7ca2ee6b11f751268062
font_02_sfnt_off00012721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1