Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f3b850323049eb…

MALICIOUS

PDF

105.8 KB Created: 2021-09-05 13:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9cac9a75d620ea7630ee91d0dfaab83d SHA-1: 400233302d6e75a6f1f21549939130c2588003f7 SHA-256: 71f3b850323049eb808d6f595281185e477e9574a6e721d05b1e2d6c520dc4a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format itself can facilitate the execution of embedded JavaScript, which is often used to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://aquatrustfina.com/userfiles/file/baxixekuwaterelowumuku.pdf In PDF document text
    • http://vitanova-cattery.com/upload/file/nakikokufo.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/u5fuevj90jkqvd9d6l273hs654/rubapo.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608416243a6e4---difatofobukutetobe.pdfIn PDF document text
    • http://zuche0551.com/upload/file/gujafadizekabawarofa.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/80444282bb821bd5101e7c865af2844c/gubaretakevoxezav.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/mobibewusut.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/repovezegesagafijasalaju.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ukuo1g9e2k119rfhujs5fhihi4/mitajuvuwivuzelorotijozuj.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/mamizovogixove.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/gavaxobaketuzizofozezada.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/90348001978.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2ce9f886c471811a903c0045f596aaf9/89072580500.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e576e679---melogeja.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/76416886347.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ede92ccce5b---70553899514.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/61798698196.pdfIn PDF document text
    • https://ahha.az/userfiles/file/97009799206.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/23916927012.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/11981404626.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/65070971559.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a0ac4fd93055ba1831bae3104fff0d86/64444699948.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/73963146554.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/zatigig.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/30259e96a3022add48d4520d9758f152/58419749285.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/89bcaf8c5fa3de3b224ace8bfd5e2ac4/38717400960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=perspective+view+drawing+pdfPDF 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_off000134cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE2 10780 bytes
SHA-256: 3cd2204b06265ec8d32d809343a5d670eea5445903e913ea80b752e450c3c31a
font_02_sfnt_off000165b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165B7 19620 bytes
SHA-256: 73c19bf0d97668b11da5159405f5575b3792b90759701b4e5ef6a0bffa7e84be

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