Malicious PDF — malware analysis report

Static analysis result for SHA-256 142e6fa6f57bb3e4…

MALICIOUS

PDF

92.0 KB Created: 2021-07-17 06:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c1a9bb1e5de0ed81cfab9b3d47804b05 SHA-1: 67da64d7d3449ca4e7c1aab1570490ed157eafb1 SHA-256: 142e6fa6f57bb3e42958823b3ddbfcc28d3207e2cf7921bd55f3d4dbb081f118
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, embedding numerous URLs that point to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://topjobsnepal.com/ckfinder/userfiles/files/18178382115.pdf In PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609441dd85a1d---tilawegudet.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6d264e0e49717bbf39477c55043d5655/33458620341.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/puxujozenejijuz.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/21325478643.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/a8b47519b1f1646cc035921063b10d0d/22294688242.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c8fe144d5---63731681275.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/kidepololebaj.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/zikokusiki.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b853e363485---puzawurizuvus.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894d93a72da---1066729121.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae650f3cf61---12312989689.pdfIn PDF document text
    • https://senhewood.com/d/files/xabitoxetawamigolixa.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fb2008e8cfbcbd9a07c75b54348feb4e/bojeketudiniwerivijed.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43c93bf158---16280596584.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e701fd270592871257be337f42855ea4/liwukupixipirizavuvize.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb5b9c06d3---63972553286.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/vulubamorurunenufazoda.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e71b46cd2---voduzilu.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/13947917742.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/12f3fb55c1574315fabb69353a86fcba/46916113345.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d7b215302---70774164133.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/90d7ec35b5b559f151950838e424c442/96646827564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hunger+games+chapter+summariesPDF 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_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 10748 bytes
SHA-256: 4c687a09d630e9bb270f21ad7361ecdfcf6c9aad2c5f5cc0f8b9c8f1ec5b6259
font_01_sfnt_off00011d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2B 17828 bytes
SHA-256: 2c2057ac3de9d91af41a2a0672eada40980feb60ea541bcf854154e5a4edda8b
font_02_sfnt_off00014b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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