Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4db75b30b197ac3…

MALICIOUS

PDF

61.0 KB Created: 2021-06-21 04:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: dfaed3eced48d2da68354e5f1f8baff8 SHA-1: 1dab2147824df589e02789dd1afa1c602aa512ee SHA-256: c4db75b30b197ac320078a5393ec2898718015e186ff1dcadb0b3d5dc7b55379
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to compromised WordPress upload directories, suggesting it is part of a phishing or malware distribution scheme. The presence of multiple URLs hosted on disposable or compromised domains, combined with the ClamAV detection and ML classifier flagging, strongly indicates malicious intent. The document body, though heavily obfuscated, contains references to 'gat5 game download apk', indicating a lure to trick users into downloading the malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a98944875---wasojuduzuzutubel.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724425473f4---16938154911.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607751b053338---83849898711.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab8ce172d---72768282043.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/luxigugenoxow.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/9adad14dc1323d408c18e8c91c650510/kamadap.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/597820a51fe2add3a45177595ba906c4/kibokibirufowin.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af94a7a5c98---torotibigag.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947a827a927---44458972417.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/76316460646.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13cab9f044---sigivojomogolafeberadoka.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/61836964766.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace783b2470---xutorotoxunadabapekidabe.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/dadetivogenid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=gat5+game+download+apkPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB296 5316 bytes
SHA-256: 00e03b5e27006835a49dd952e37b758e934946df4cd24a85476540b883b9de37
font_01_sfnt_off0000c4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BA 10260 bytes
SHA-256: 7a659575fc25c0ce87b7246ce291b36a288fd4bd844fe6167d4bd57668ce1765