Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d405395afe1658…

MALICIOUS

PDF

75.2 KB Created: 2021-09-07 02:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: defdcb474aa56cc2400676f280ef8f8c SHA-1: 26cdff1f16374ff0f07d6f471636bc2ccf461a63 SHA-256: b0d405395afe1658c805b2d6a3c013c513603ddade0591612bccfb4664d93e4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The primary purpose appears to be to lure users into clicking these links, which could lead to phishing attempts or the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://99hospitalitygroup.com/ckfinder/userfiles/files/mugesutewurabajad.pdf In PDF document text
    • http://whatdwellswithin.com/file/27029174040.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea91cd358---26554376750.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/8k92hrfo0p3oi62i03bu6178d0/85984882553.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/db6qqfub1lak5phiganb9ors3k/serokazo.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/46489650087.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/95567377017.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608108bf58961---17972125830.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/balexonaz.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce1b85437---27710079271.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4df2c0ad91---jegukugifa.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/54921515996.pdfIn PDF document text
    • https://digireg.org/upload/fetug.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090187a733ae---46985625171.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/zuzafibe.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/eb56201e4e27b49fcb42c97b1848ed35/76302658684.pdfIn PDF document text
    • http://ramayafaith.net/clients/64268/File/35954636040.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/llmmeeiss72mn8antp4rsc0035/jotekefebotoz.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/kidik.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/43989575637.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78882066728.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5f8911e8ba14c3c20a8636caabef8d68/dimigu.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/mokuxexamefosulom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=echols+ice+shaver+manualPDF 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_off0000c3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C7 17100 bytes
SHA-256: 7f87301a1ead45283b3d8dfdbbb3a0e2d594d48e60a85f6c234785744b55e49d
font_01_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 10548 bytes
SHA-256: e69783e29853db5191121eff1dcf676d9eabb2e7ff8b1c68ff0c9232b4f46b6d