Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8a6b52bf6c7e4c…

MALICIOUS

PDF

85.6 KB Created: 2021-07-18 23:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 75085da598362c2d6e36cf3f620f11c0 SHA-1: 690b3a034e3de9162d7e1bccad6b67ad3434890a SHA-256: 3c8a6b52bf6c7e4cf524a674e3e70be41daf4050475dd91058998cde2a7f33fd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple compromised WordPress upload storage locations and potentially disposable hosting sites. These links are likely used to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160c9065133668---1570685461.pdf In PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a645e34afe5---60873019128.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65042da627---lirodanenagajutupe.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/963ae1l7m6gen77evmarb093h4/duxesif.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/87443001489.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4778088ced---botunagejezorabopemepaj.pdfIn PDF document text
    • http://teifsepahan.com/files/file/56045876792.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/65536571404.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/zemetowadobewi.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608f77650f19c---dagiwezu.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/99541392957.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d65d70c74---laginalifikejaviwifa.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/tuzerobubebuxuvasulibavo.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/15145151475.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210702_7540C97658ADF249.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/wajejobatujalagepowo.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/katizirofodudumi.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9f0c6233---67871980676.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/xizemegigorofifagituwaxa.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gpveg21anl62p3fisiq0i182qq/wofegakegatal.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce3500437---86552627855.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/livixapazemofu.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/jezinoxutebezifefen.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c034057c86a---26817734303.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/67180968256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+scan+pdf+appPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/fe8d62695809d13a9b6d0021ac85d917/74750923860.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_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 10316 bytes
SHA-256: af0113f3feb5eb184bdf40262e077a870b4c6f17796c610139a426fe7bc33cf4
font_01_sfnt_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC3 16800 bytes
SHA-256: 5a48731dd62604f70e23054f1e727678565f165e55f7118ceb9ff7b9f3e24938

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