Malicious PDF — malware analysis report

Static analysis result for SHA-256 c048cedbc407dfb5…

MALICIOUS

PDF

61.4 KB Created: 2021-09-15 00:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e346fe3b9242592ccbea31bf196cc85a SHA-1: 80b8c41adbee6162a55599a88d86afb3e44e7e65 SHA-256: c048cedbc407dfb5a9825e0debf0645d4f72100b9279a0648e3df80ae39d554c
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

Heuristics 5

  • 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
  • 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://chowdhurytourism.com/ckfinder/userfiles/files/perexefeporaziboxoged.pdf In PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/6458180621.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/zikefixirajomuw.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/33263394943.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/gulasepugoxewifofejobubo.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/3211e81fd7e82f1323437f4c79e95605/fawikivareboranumuvul.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/98837740634.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/dapukusijilefisob.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140abe0bbe85---410281307.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/bosis.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19649453929.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/mefalarek.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/2452819705.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/vatuzawamafam.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210911170927.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/fozikuwujiba.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141106382c43---romodaguguwobososir.pdfIn PDF document text
    • http://vodnik48.ru/content/file/sovitawelimo.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/2077162592.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/12500189510.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/61059833680.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/xisokokixobedigamamut.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/zavijavex.pdfIn PDF document text
    • https://olterus.info/contents/files/polurisedaduwelididozoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=firebase+messaging+foregroundPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E0 10772 bytes
SHA-256: 1521237a0aa4651ddd5760bb3a358acd5a9f0ec41ce7a1d276ed5ed8aff1d232

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