Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b5556e5b7a5830…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 20:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: deef5de7b4e0c132c67c7812481783ba SHA-1: ab513d2c520583694401b6da15855ac62ef37796 SHA-256: c7b5556e5b7a5830040a054801e87f1feb319a33aaa59177918dc7c4aea278b8
196 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. Heuristics indicate it functions as a link farm, directing users to various compromised WordPress sites and potentially disposable hosting. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing malicious browser extensions or updates, which is a common method for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crysiq.ru/uplcv?utm_term=windows+cannot+connect+to+system+event+notification+service PDF link annotation
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/l9a9l15c05ujgdk6btilsbs5v3/1546666901.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d59eb1d14171ee35a7f6b16ca8a14033/kemikigazasizabapajog.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/23860407789.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751c478f279---jibaridekipubetosojasuvej.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/zisozipifupus.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/lenugem.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bab8ac730a7---solasaxofigusubazigabejiv.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071233f7365b---31625385175.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ac58bf05c71d0287e95ce0839cb859d8/mozezid.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/jisapeketarov.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/47103759659.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/58650511523.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/21431553232.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/97ca75d76c7bed567d27521f9f424a86/mozijuwe.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qrtv8vu4mgh5mfevqlt9dkc46m/zakakorogigenanasofofiw.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/66410735658.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/11000732076.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/63278081228.pdfIn PDF document text
    • https://kawanmto.net/contents//files/nuporogalidumi.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092af1ac6e32---lorirubasebobakujot.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ff4928a5---buserud.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/11827063076.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_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 10852 bytes
SHA-256: b77321209a5f6001ccf8d6d20819d52d84decbb53ba0d7a260619209311b3ed2
font_01_sfnt_off000101d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D2 17340 bytes
SHA-256: 94895ea25c026c41f58b1c43e0846040ae55b19778c2ad5631fc7504d1b08370
font_02_sfnt_off00012e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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