Malicious PDF — malware analysis report

Static analysis result for SHA-256 b348b2c2aa490436…

MALICIOUS

PDF

84.4 KB Created: 2021-08-30 10:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81755f86297f00ff356efa3f7a5ee6fd SHA-1: b1071eb55051d232a04601e151e72ce5dc455948 SHA-256: b348b2c2aa490436b390b177b47a64eb65e8439c1ec6bc70a3187f9b5fe2d22d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e003585e204---vamun.pdf In PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/rimaxonim.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/6ugj09rk5dufr1hdbov6d8jtba/53816874376.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/lalimixikefarusoz.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/69214652878.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/sekivi.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/nenokififilanogeti.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/46700544790.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/fawoxa.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160890eafa8215---kujojazejawizo.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/buzawa.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/fopox.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf0eb5f8c---tilavu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/drof0hdb02u1hskehla2m9rb80/bonezoboworanenilevo.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/fovaluxakaxorasokup.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/kulowokuxomiginugakoj.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9215499a1f---xakabuxupozisak.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c32f9a2c4---92670264692.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/65743069244.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120f107c8b05---solisugopuna.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/45968236760.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/53042467256.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/46385681832.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/mubugo.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/81535297264.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf55a0c7ee---83372694570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=all+boils+down+to+meaningPDF 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_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 10700 bytes
SHA-256: e3f235ac31dea6bb05523cde694dc1fafaa0c82da4e558d7a456b3933e52ec77
font_02_sfnt_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 18536 bytes
SHA-256: 3dd705bb7215ca1ab35d6264539f80ae972c90d585fbc975e17a2838f65d6bd5