Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf2edaba7801f0b…

MALICIOUS

PDF

72.9 KB Created: 2021-09-16 00:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0d89ac4c32fb0e52a2d56cc249da316f SHA-1: 7577fab6721285976ea88a49461675d527bf7c98 SHA-256: ebf2edaba7801f0b21958a340abf9d8917e57647b1a03b07aa04341f564f646d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://multiflex.ru/userfiles/file/18459615163.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/snodiuv46tmic6v5klrabcptcu/62923520554.pdfIn PDF document text
    • https://europartner2.pl/uploads/taduxepujud.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/bupojiwonuzaxu.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/mopazewiv.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/86054206198.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/xidomepulumufutezigap.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/tazekifar.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/mujofepep.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/lobepoted.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/13851429200.pdfIn PDF document text
    • http://domuran.pl/files/file/nozovibegajuxizap.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/kimade.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/63c8c900ab789a400bd5dcb3d1e3b3a7/84393761382.pdfIn PDF document text
    • http://palami.by/images/file/47840312024.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/70651738450.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/37279484845.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/912718586.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/zubugojojasufususefo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a95e1277---joked.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/54b4902f514fc43a1c9adc4a21a15b87/46850132851.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/nufitiruvarumemojunosafom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=vidmate+app+download+14+mbPDF 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_off0000bc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7A 16368 bytes
SHA-256: 317b9eaa29d4739e69d69b7b5627b7207681a53c98793f46fc61bd671830cf75
font_01_sfnt_off0000e64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 10608 bytes
SHA-256: 842c3c992d80c0fb758c8d8f6fedbbca39f1c4a28f53fbdabe940dac9a23c2ea