Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2146aa8842d058…

MALICIOUS

PDF

89.0 KB Created: 2021-07-02 21:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4701190cce2b959113ab48e33880dc07 SHA-1: e841efdc855b5322c1bcffeb784a4a8636660bc2 SHA-256: 1b2146aa8842d05896e8ed91f7315e108c5c948e7467f9e934b4e48aecd8e2d4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress installations, indicating a link farm designed to redirect users to malicious content. The presence of these links and the detection results strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b7c220b000af806da3427b1fa5187e78/lojerutetigubiz.pdf In PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160872323ab0f3---86920901674.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3001ba9377---97302624537.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f60fd46c28c3f0d883adeccfa286d880/womubebo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8c7ce768b---pelosotugamalemo.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/25678839185.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/34180061560.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/16078945585.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d78b4c5a9d---31397510311.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/10017647806.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/jexevefumijulewikos.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/nanerotoputokib.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4eb7385ba184afa75f6d7250db42ef71/viburenogazujonimujilu.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b54bdfdcae5---siwimexaf.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/1889a25caacf20bf5aec6fbcce434ef3/27174259757.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ikusv1afpk960kh9b3tfqjfoh8/47992219601.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/mebetibuvunuzoku.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4688c99e8---lujivonuxazenowume.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ddf46233---sokufozal.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/b4cf1178323d8fa4ff83acec7365e918/33845236617.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e6f117f7---41615832830.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7568c5c0b3---robured.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/83518828842.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qstqh094p1mjr6okd8vs7s13g4/wolunotawoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+metal+foundry+sdx+torrentPDF 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_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 24168 bytes
SHA-256: a57430e4341f4d3bb442007b7724c51f01c1bb2740e9f96935a10e1d087e0be0
font_01_sfnt_off000125c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD7 10808 bytes
SHA-256: 2850e281fa975292adde44bf6b871c49566452a45900f17146daa57857995b62