Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c51f9a8352a0ad…

MALICIOUS

PDF

113.2 KB Created: 2021-09-15 16:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 08ed93aa1ba5edfafaeec473a1b72fd4 SHA-1: 8a3c63cf8e9725bbf2d421f5d4989a4fafebcfe5 SHA-256: 49c51f9a8352a0ad8cad75686661a12026329e64dcd5d0e4331e7786c614a6e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://coretry.ru/uplcv?utm_term=pokemon+stadium+2+n64+emulator PDF link annotation
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/380e5452adee3e481d26c422e4ecb956/77768531020.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/436f756611878ee540baa554e5c8d70c/53110602960.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/luwoxakonetetovupo.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/2472480804.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/501de88bbd62442649748dbfe3cccc09/bivodulizusefalimubot.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/72224684496.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137764fc3315---97236276628.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090419284873499.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/puxefowan.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/37220672476.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/rukipusiro.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109061602396692.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/74182486328.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a0e9af0a3e6c6dd1863b29f2c8b40a68/kosegozamozuvebaz.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/81182794216.pdfIn PDF document text
    • http://aminotp.com/upload/files/lipaxovikimugo.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/kitizilitiruxudepus.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/javivujekimamolununif.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/0ea4dd6a4af24906fdba838a8d167a14/22329068752.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/foremekazubanuzosewegubom.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/89575463074.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/xulatatamigunenisol.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/pinesomivisezelukup.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/pakosawebeliromudowifir.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_off000148fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001610f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1610F 22852 bytes
SHA-256: f9641100c17364520b32ef3f97fd12ea045b9a9f6d4aeab5ef91b584d93c32ab
font_02_sfnt_off00019d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D21 10968 bytes
SHA-256: b496cce0e9588f3355774469cf96ff0da4292083def56d95688dbe18a3c877fb

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