Malicious PDF — malware analysis report

Static analysis result for SHA-256 b203be9c89279854…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 04:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4117e3d835c2669ed21347a6cc272e0 SHA-1: 60ac19d76aab83a225f453f6a7ac60ad599c668e SHA-256: b203be9c892798549c24142c840f34c88b6b8cf7f5c4d25212fbd2ac8d5dac12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting a phishing or SEO poisoning campaign. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=galaxy+tab+4+reset+to+factory+settings PDF link annotation
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff5f748e8a---29915123594.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210908162938.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/55502398688.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141a5c4d6607---rawovofejisilaxezabek.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/gorinogajuzipiroriguloxuz.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/71556416740.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/52867647134.pdfIn PDF document text
    • http://bresky.cz/res/file/kikuwusuvegebaxuzit.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tevexiw.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/sidajibi.pdfIn PDF document text
    • https://kulittelor.com/contents/files/30405905632.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/64019335354.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/56471942992.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45645118811.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/filobepevimope.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/jakosab.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/68457470414.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/75548381043.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/nujemumezu.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/kivujotekakoropavojim.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/13679293247.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/jerekifosajakezesuwak.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/67405107021.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/68576135699.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6e8ffcd---87510508156.pdfIn PDF document text
    • 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_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 17716 bytes
SHA-256: ab17b87c00d5518af13a350ecc8b240346766f2f31893cc1440ad365d1778e9d
font_01_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 10984 bytes
SHA-256: 4959fb8182adddf1059e58d7e0f97b9f5f821de9797c199b24f20e5b88d24733
font_02_sfnt_off00012912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1