Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca553c62a83241b9…

MALICIOUS

PDF

83.8 KB Created: 2021-05-26 07:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: aea482d4dd64989be2d5488b752c2c5e SHA-1: 7ca1e891804cdbb207c67ab834302ec528fc682b SHA-256: ca553c62a83241b922b63746d6ead0c5f30ab76779f0a7c80bb2ef79f93af525
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs, such as 'https://chcial.ru/uplcv?utm_term=rockstar+social+club+activation+code+gta+v+free', are designed to lure users with promises of free game codes, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=rockstar+social+club+activation+code+gta+v+free PDF link annotation
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a7dc40906---vetekegagiw.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tfavu13novap5b92idrq57d6pp/41163682286.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/743bf8cd0dfad7b2d5870c717703874b/83245840662.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/jkb0l3pctfv6a6lrba3id74kj2/dotawefuwarugixesagadako.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210513070400393.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7e837939dda9cd557fe1aaa1c3ad7ae/webisuvuwuwubudazik.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098922ce3d95---duxozusiwugabofosiz.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/ed40ee203d0dfd92545a052f10c1566a/bolisatifevupiwutuduzuwo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/e71ugjdc61bikap9665qo88gb1/13216301030.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/ueik73slmt2fkdqn0raovqso8j/49165919389.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/23508206739.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/7edc2019ea5cc3430546e36592907ac5/juxataxovo.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f0dae72e72740016e1ef9ac6986afb1f/fedezapi.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/670a49687da6b6b25dc4c8e99da9786e/75742796029.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/98902307778.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/1jjc25ovqu005sved5i3uftisj/babolufelezuladiwideneb.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1d5234bd---letuwowisabufevo.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1ad009cae---kunolopujuvamuzevukanuwi.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/52097898706.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 5460 bytes
SHA-256: 8ef1f3244b455966bc57ea49da31fd4ccd2c3b44e66539a0be6df3d8af3c16e5
font_01_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 12332 bytes
SHA-256: 5429f69d195e7ebf1ef084cd964db0daab30d3d29b21685766c0c1d629227ee0
font_02_sfnt_off00012744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12744 17112 bytes
SHA-256: 8d931078a8bda077e62b6226989e9ca7a204b5b2ded984cec863dfc844f848f3

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