Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6a0f94b0c01205…

MALICIOUS

PDF

81.9 KB Created: 2021-06-18 23:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 92e765aef4bfddd29f6f2cab3397a5f2 SHA-1: b74b16940d10d61523468229c2826c9d422c96a7 SHA-256: db6a0f94b0c012056e7e89f835a56d477907cc805fd6dcb52fcdd264f08f85cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised websites, suggesting it is part of a phishing campaign. The document body, though heavily obfuscated, appears to be a lure related to financial reports, likely intended to trick users into downloading further malicious content. No scripts were extracted, but the presence of multiple external links to potentially compromised CMS upload directories indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://capital-tic.com/upload/ckfinder_temp/files/20210528054220.pdf In PDF document text
    • http://qytbearing.com/upfile/file/77370564719.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/8ralefjf9odhg3drd04fb8it2i/65500536010.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a8e414c6c6fdb24308871221dd79230f/wedukejutonuta.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/xiladidugo.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/jdtmqe2plm46ss28585rsnble2/fewosiwurov.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d3de26ad4454fdded86ecb39e41bc2cb/98855106781.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/fb8h26sv8b5ua63enfbc540b96/motosuso.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/254e956e8daaffb1ef9f378154bf2a3f/rusenijaradadenufajip.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/een13su28l8puvmp6lop79q6r5/17676017757.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef3ebc4e4f---liwotudujowipowibo.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/8970093518.pdfIn PDF document text
    • http://kasargod.net/uploads/file/62308183108.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074a43304edf---wupipa.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2003fca83d---jubub.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/25a434f75486e51291f46758a6729033/59498247015.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adc1063d339---14862073944.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/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=warren+buffett+letter+to+shareholders+2020PDF 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
    • 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_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 5424 bytes
SHA-256: f8f0c7c575eaafa95d69e4a574570b9cdd2e5713becbd37a710da1075fdbc097
font_01_sfnt_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 11444 bytes
SHA-256: c66bdecbf9545a5c5c820d17d19ded2764cdd063d1fb8e23f3493638578fa37c
font_02_sfnt_off00011fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD1 17568 bytes
SHA-256: a85cd4660bdac8dc9965fe4f1f786364b6cc18afa4af9e70df5da103a25471cc

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