Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93fa2669c2fa452…

MALICIOUS

PDF

85.2 KB Created: 2021-09-07 20:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e7c897eeab8f9491eada5b049e97ec2 SHA-1: 6dbd9588690a7ac827cff91903bc04903b5feeff SHA-256: a93fa2669c2fa4522485327616386d47d234b5bbf0253aa0e2efed318e73f8c3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to external websites, many of which are hosted on compromised CMS uploads or disposable domains. The primary purpose appears to be redirecting users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://aradmissions.com/ci/userfiles/files/70129682785.pdf In PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106220150513996.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/padozererilevuzusi.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/82044981422.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/97357555340.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b7300e5aeaf---kutovisunofalebigifuzex.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076d34a22e6c---53978037204.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b7a81a1ac48---kerijufefof.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/tapovebomevo.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/80363635560.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/duzejuwasobevavafutakevo.pdfIn PDF document text
    • http://iknow.pl/files/file/vavaretet.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/59749780138.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/usap24bcn4822ub5alvld3b5o1/vulajolerobaran.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/48549309577.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/18315727399.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/50001915555.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/fubiziwidepebiwavamovu.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/78036921427.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789813ba55b---33260257184.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18b7295370---54572181436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=food+chemistry+and+toxicology+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_off0000e381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE381 11260 bytes
SHA-256: 1e2d7f3b89ea206703806f6da607aeed4919538d05f481e69d8280dacd5ede88
font_01_sfnt_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 19048 bytes
SHA-256: d64bf07be3c4a53c361153bab88840e61b22c2a48e96a9fade85b72555cff6dd
font_02_sfnt_off00012f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1