Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c50f63966fc54e…

MALICIOUS

PDF

81.8 KB Created: 2021-08-24 12:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fcc0390834a9a891bebcef49743414af SHA-1: bba9aa8848aed53c126cc3f29735ec1db4bb921e SHA-256: 37c50f63966fc54e31cecb456b8cffd64da7aa2cf1e96fc544830ea0b499d3b2
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains or WordPress upload storage. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://olterus.com/contents//files/bododekevebuno.pdf In PDF document text
    • http://berbun.com/user_img/file/95316394450.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/60208868593.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3332b8c46e---70059716335.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/73521623819.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/37799114652.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/97481662676.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a92ef2bfe---luradikegamajubaf.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/67920658420.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c851db75fb---fimejezewa.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/70a8fc6f50d00e9a919aec9454c25994/jukuzolojewuvilaluxa.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/wofexo.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/39455910812.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a877229785---32548440298.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/51366856520.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e7a4c3eae---wodifovubilogizenadanez.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/guzuwalafujuxigabijawar.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/44375327417.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610d91e331774---nomexexutatajojitunovu.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a40d2a8711---61422647158.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/lisavesupopiz.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/2311491051.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabbe00665e---97388365083.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b786fd6e25705c8bb5d3f2331798ec10/positawamesozedumopuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=arc+touch+mouse+treiberPDF 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_off0000dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 10404 bytes
SHA-256: 9894d1af942c6562087ac6a9aa8611b14a82723d0fb793bcac04a798d643a972
font_01_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 17448 bytes
SHA-256: f81ed7a8c77324a0665d42d71bfeebb1518e76d6168ad314d9e87704b40dfafc
font_02_sfnt_off0001214a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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