Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5454e9650b6444…

MALICIOUS

PDF

73.6 KB Created: 2021-09-05 13:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21478fdfaed369aa0a1af412c84beae2 SHA-1: 4084e9ce30bfa4fb5a13c606a44140836ef07d35 SHA-256: 5a5454e9650b6444cc0bfbae643587cfe099e8350f78e54077f2415d135e04d5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing attempts, aiming to exploit users who click them. No scripts were extracted, but the structure and URL distribution strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160728ada85cf1---60004670497.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdfe4de580---rufewufa.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/277507b86e2b20050b811bc523546dbe/77478784160.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f181071f5---fozatemefewinas.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de157d58d92---69113339111.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/51929155025.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/xovajikototek.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/26824789338.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/83237981740.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/weveziraragafoxipogumiko.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/netudenadodawovas.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f13e1f06e---parugufotafavad.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/0111d18cecc1d27d403816aa3175cc66/jasepulagafepawunof.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609280b635ba9---65291970834.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/c31b61cd9cb2be95bee2b0736fcd6a29/mukakapojowilokababejo.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/86041709906.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610731e164fc5---61903581664.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/sejopugizavera.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2c8a8734c---5036849434.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/bixoguverejofe.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/jexusipi.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/nuzoragivutijunufebege.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/gisipefitexagasapipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tmbu+ba+part+2+result+2018+pdf+downloadPDF 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_off0000b873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB873 17468 bytes
SHA-256: 0e7c0cf182bec5e61ebd2928de47dcfada0975c40064522166dc70980f084912
font_01_sfnt_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 11360 bytes
SHA-256: aba8059180e6d5a7443891064768b4ee9df18687fa90d00139d399757768eec6
font_02_sfnt_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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