Malicious PDF — malware analysis report

Static analysis result for SHA-256 9045f544fdb833b9…

MALICIOUS

PDF

75.2 KB Created: 2021-07-14 03:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e3456984f496dde17ceefd4370eae756 SHA-1: 17e353b5710ac9c95b3535a5b0c89a2c02f588dd SHA-256: 9045f544fdb833b9fb6b47016895cedaad39314d64a4ec6de34a1781ce25e93c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://queure.ru/uplcv?utm_term=cubic+feet+to+square+yards PDF link annotation
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/818249295d52be33e34c1297c74af117/judexutu.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/374c98b486468187bfc6b60df0e3c514/22813460568.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/bukuzosupajebeguwane.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1066e22b8a---22498162881.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/foruwepaguseduxazeribitaz.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e9cacdb3af853d7453bdd00787fe00ff/52648630533.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609cff2b19ad9---tevigafuzotumotarilidupix.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/27188336460.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/2d238afb9a86c555a14b70f069f855c6/mafilenod.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/lofegenufab.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/54496601095.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/53e3e8b3751567552a85dc678a66c27a/74107860133.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607335f393731---77071074462.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/zuxedufasobaranab.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/kokodepif.pdfIn PDF document text
    • https://saam.vn/images/content/file/43669858936.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xisejaxifukusas.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/5c27709efb3f20d1b7ac98795121f506/77899861042.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/11019144017.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160904aa1a730c---jarifurukoparuteverebafel.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcda135527---nunesepupasakitipu.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/1cd449653db93b38c0b72bb54d4cf4e5/fuduko.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16098332d860b4---dizigomopunumibapadilerif.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/widegikesejumogu.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a131e83e77928bf1b7fc872201317259/3159542537.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///nenatujara.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_off0000c26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26F 10848 bytes
SHA-256: a85698d9af5875bf1805a00ef2df95224ca3fbf62f68a69b4f8920619d9a9908
font_01_sfnt_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 16240 bytes
SHA-256: 523d4a1c77e3be542001e0a2ab3910da6c655768d8216b2ffb0501bc2230151a
font_02_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1