Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efdd27dde77be06…

MALICIOUS

PDF

87.3 KB Created: 2021-07-05 16:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 643c2fc967f08103d4a62048a0cd56fd SHA-1: 48c13d222ab30667cb6575e0d9ddc31dd4bc9a8b SHA-256: 3efdd27dde77be06e269c6b63bfb3971dbd0a1aa253a3c99a6b7be58b7a9921c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to various compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/p0jhkf832cbu932uan7b0fohav/kenulesidexisap.pdf In PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vb7btqqtnn3gl8h1ogs5t4eh06/40644956959.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073de9ca51ee---59715239845.pdfIn PDF document text
    • https://edarky.net/data/file/50554366469.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/povepiw.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/fagakonuwijexebasem.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/mirodadiku.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf427a26e---58191165720.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5f459b57924e834c51b79a4acf8ae197/rojepijimi.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/1276bb8113c7e9a7b3b95cd865c4a43b/39145034305.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/af1f444d8cbe27416d2afa6d7516e880/93514595625.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b3faeecc1---lisebajivofa.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/46907756133.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7ff03201---rizovipit.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/00eb8rov01hoatnsdmci4fdkcp/77472247240.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc0347f9d2---zufozojejonerogodupav.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b93f09a00e---1332462041.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/22384499983.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc043849e---totetaxarolimixipifamegul.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/64423583573.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b31bab3d---newasoxevuxefav.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/rorim.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ade3662ad50924115bfec104d9a35b3e/29576090351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fat+in+ricePDF 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_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 9868 bytes
SHA-256: 67489b36093e93a9e945d1f24ddd144789b1eb11227cd2f37b9afc8588f76a8a
font_01_sfnt_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 17364 bytes
SHA-256: 33220b71494ecf56a1ab474cafe3c49b79308ebedfc6ed9c325909b30dfa40be
font_02_sfnt_off00013850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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