Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52a33caf3ffcb4c…

MALICIOUS

PDF

72.3 KB Created: 2021-09-14 02:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e32ec208a0959346df3f966628ff97e SHA-1: edccfb8b36c46133092cc29c74dff0efe8119d3c SHA-256: c52a33caf3ffcb4c5abcc7cfc684e97843c5dbcafd3b484c35bb5412fc8b51d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://wintec-samu.hu/uploads/files/vesetebixil.pdf In PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/17788028944.pdfIn PDF document text
    • http://net-marketing.hu/images/files/sebulekawesovesaxavuz.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/salamipasijibemo.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/zugokewezezubexopifuvapo.pdfIn PDF document text
    • http://darstin.com/userfiles/files/kezelotekiwijoxoxoluse.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/35132263382.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/97232402532.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/e3a32bbc2c5b984cc1ac219af98a61c7/nekomejonuloxigigozev.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/rafojeba.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/jokewawuwabeb.pdfIn PDF document text
    • https://revive.fashion/upload/files/garuxerubavixokoviva.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6132568815ad3.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/16888530348.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/kikanelesola.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/75444179772.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/sotogagonuvosufufovatuxur.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/rimeka.pdfIn PDF document text
    • http://primaneighbors.com/userimages/wemakovuwezu.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/64276742153.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/37142695384.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/89344463717.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4ea095f5---bofumepobexegulazulozi.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/82795932183.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/98982229033.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36e0cd42cdb4c945091e7ad1b1232cdc/86250351259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mar+gaye+oye+loko+full+movie+hdPDF 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_off0000b963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB963 16168 bytes
SHA-256: f67c26d4d1d6d638fcfb0c416e7a0295422bf7ca4db607a980c7112f143ce9b9
font_01_sfnt_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 10796 bytes
SHA-256: 4375dbc57d9aa2a82e55e2850176d98e96c7c69a2bec249a6ba2b84127fbad59

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