Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a45e47d687539f2…

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 23:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb93be45f6021ce1651d8821ff8f1798 SHA-1: f41e34b37cac70978017a55d3cd4deb70206ce8a SHA-256: 7a45e47d687539f207e0f2b5c9bc72ef657393eda8ea0c1146eddb091a33a455
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV both flagged this PDF as malicious, specifically identifying it as phishing-related. The primary function appears to be directing users to malicious or compromised sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dajuicebarus.com/uploads/files/furisisafupobux.pdf In PDF document text
    • http://manixcnc.com/ckupload/files/nobuviguzewexuzomodewe.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/11565969411.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c132a215e3---sexokuxarafijisedemekap.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/mujofudoxigalixi.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/55617532193.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e68f72bafdb---18197169460.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/ropuzisusaxisogaro.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/91785436259.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec547af7ae---kozuv.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9818f2ac8---4830471415.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/dapivinarewobimunebuvekap.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/wuvudib.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/lofesiwege.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/7465822978.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/patoloduvurovokezafimip.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/50677774975.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c29aa46e---98508274228.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c261a861eab---noxutokeboxudap.pdfIn PDF document text
    • https://emmaushuis.org/pages/73195126976.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/nazemukusixarunojosawusok.pdfIn PDF document text
    • https://unosms.us/userfiles/file/pubanuduzaxuzozu.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f76e0ca66---1763622298.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085282e045e2---sixuba.pdfIn PDF document text
    • https://almavilag.hu/files/files/7549712583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fake+news+detection+using+naive+bayes+classifier+pdfPDF 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_off0000b997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AE 11368 bytes
SHA-256: 96f3a811f4eebbe3ca3959ad678e97a57d3efae900c83b8aa52db2f5417bb88d
font_02_sfnt_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 15124 bytes
SHA-256: b44aa72989f55b1049ade69384d0bc0917703f9dfe2888e6f8db0566fbd4d2e3