Malicious PDF — malware analysis report

Static analysis result for SHA-256 17bcbbd865a5d7cb…

MALICIOUS

PDF

76.1 KB Created: 2021-08-09 12:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ddf50217b3e3134568b8168b7a627d5a SHA-1: fa6389670f81cc7159afd5cee044dea7083793a5 SHA-256: 17bcbbd865a5d7cb3c29d8210c8002c86314f10e237541b28fd9e8167e10f3b5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains. These URLs likely serve as lures for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=fulltone+sb+2+alma+bender+guitarra+download PDF link annotation
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/k5c9ac1eb88l9vrjip6j0tftfk/11079056336.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/rabexoda.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/83761281645.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/widudota.pdfIn PDF document text
    • http://markone-tools.com/upload/files/wipajukotidolum.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/5777dccca2575116b982f90f4ba05cde/81294792545.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/99093441260.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/16312229473.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160879060d6b44---61291293719.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815690e5531---17848942163.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703a8a3c0f5---61421753177.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/4e2db78f15bfb0d4b1b871e9f032faa5/juwojubidi.pdfIn PDF document text
    • http://infunplastic.com/d/files/bezazariduvuxutizug.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7757b930a231f62e2ad80b658addf94/34584477122.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/kijuwidineroligoxuvamu.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202153071216225.pdfIn PDF document text
    • http://wych123.com/upload/files/zuwekemazakowevavipiwi.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/bedavawigusura.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bivoqgu9t31r8cjmsp6jlvi8c6/11139140534.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160840535e2547---deziwugolekutalagonuv.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc9fea872---55631849686.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc18c3c61---71821406860.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/rukolagad.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8df97bff0---gilepes.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_off0000c67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67D 11012 bytes
SHA-256: b4ccbecdc6e85568e880c98fa9c908a7518285f9278d79ded751a809b1c6278f
font_01_sfnt_off0000dffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 16344 bytes
SHA-256: 356d44603c002bb966d6139c862ca96ffdaf4375a8032094aa5fc82a396a41ab
font_02_sfnt_off00010a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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