Malicious PDF — malware analysis report

Static analysis result for SHA-256 816e429dd6282017…

MALICIOUS

PDF

85.9 KB Created: 2021-08-13 13:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1a943e202aeffb46bb6b411262ae91a SHA-1: d761b1846f71d50f3960d34a5764f7625cacdd3f SHA-256: 816e429dd6282017df27fa656540aa7fc2afc4fe5dbe2b79959f0e1ea56e3aa8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=how+to+pair+onn+bluetooth+earbuds+to+ipad PDF link annotation
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/40299748753.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083726e6b438---68968348792.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4343772b48---57497187930.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b18620485---61913904246.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/gidofikokupalurisafon.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/dc7394501a58e4ee11e3eca900d75097/zizip.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911e4626cf9---bekaxisotoliregulatuzip.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/70985168867.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/64528496340.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/xorusiranamiboreganotof.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/cdcab9903b73189939cabdbcc661c4bd/wariwifewimofita.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/fekimamozebodefuleses.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/27f7834b4df0bce56c5e499edce9766a/bozadikiwovorurazo.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3a2d491f6---larutagisadajefawetam.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/7vi29gcv18isciu1b9olvubf64/zuramujubugudifut.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/69047336111.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/76403835071.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608524ff52260---78291812083.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/fadezunurezer.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b7b10d84d---31611866230.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/341f66da68d2c99f6de519d333a6096a/kizuxosananegumi.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845d7df34e2---19558216800.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bb871c8fe---votaworalumoxojimofi.pdfIn PDF document text
    • https://area5srl.it/file/notisufavunekumege.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_off0000eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 17076 bytes
SHA-256: 41983133ef22c177205fbeac1e660c1c93eeedf1ea5ed4b6efed6108a1b10a27
font_01_sfnt_off00011772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11772 10808 bytes
SHA-256: 4990b28c2a909b6b4b68489bf093d387b2af26d60e5012a181a1121bdb1fadd6
font_02_sfnt_off00013011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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