Malicious PDF — malware analysis report

Static analysis result for SHA-256 052c6ae4c9bf93f1…

MALICIOUS

PDF

88.7 KB Created: 2021-08-18 17:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 56ea3cb26239d52281359a56ea7898a0 SHA-1: 8c42489d788324a55654e27dbcb320d6f331ccdb SHA-256: 052c6ae4c9bf93f14fb112a854eecd2b632c9c539ffa7d8e879e8e65d19feb0b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other potentially malicious sites. The presence of these links suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://clair-environnement.eu/catalogue_dynamique/file/58151281746.pdf In PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/27a7sneh3obo5e6c5d96anaqn6/mipukibajekurixe.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097300019c69---19837591190.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161190e263efe0---bigas.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/18763164757.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/adc5302adc129ccc79f1c50478bf4e5a/78576252595.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/73bdbebf6f3129ebb4970988c3dc4fdb/29288591394.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5640be862---jenujufajod.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/55418987337.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/fojajimemeramowaliwad.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/xebukorupawerutemigitonu.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/54440500046.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/3454af55f2bd0360d8176488a29a54ce/10147255410.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a47488b7cf8---59365968210.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/89912876253.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/3d6d586d1d3544932b78db7b843aa729/wipupunijujupenepigosaruj.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c799b495a99---nugolewetoledi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1b2e2e9ea9dc8910d470e37e9069cc71/73676006990.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab5fb4edde---tuledinotuxobedajajete.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607660759f5fc---zosolomedez.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/xeledixovulekuxakebite.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/94756570252.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/17264731280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+many+ace+are+there+in+a+deck+of+52+cardsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 11232 bytes
SHA-256: 5811367749a394bc9319fbb2675994cc061acf3ba4de21ef706cde02fc943df6
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 18144 bytes
SHA-256: f35f8ec1441195a6dc293f18cb96f7c190983bf83ae9cdff8815d47915ac474d
font_03_sfnt_off00013c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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