Malicious PDF — malware analysis report

Static analysis result for SHA-256 63330c6e033a2b14…

MALICIOUS

PDF

85.7 KB Created: 2021-08-09 21:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e984f8199db02f7b9ac00815a8ed9e1 SHA-1: a101a27a7c0586d9782656cb8af1234794596cdc SHA-256: 63330c6e033a2b144f838daf7dc6b7dc19389850062bba74e8c225acbcb8b002
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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=how+to+create+afro+beat+on+fl+studio PDF link annotation
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/d4d5840bedc296cdf2859372b353ef53/77551274839.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609056de31617---80917904025.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/03be9ed9c84e7976b2f89c0fb7e81cd0/35291205712.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ioq3mtscsng3k1i9v3j7c659q9/nororarozobogox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd23db4beb1---sewiziwunaz.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/553db6c8582d0f6859ef2ed5fb0c611c/gasaneteloruxevemalawede.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ccee8ef2f6a---74278895850.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/gufivixitak.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/84486473540.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/wobunimi.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160906129363e4---13327042681.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/bamabelavoketilo.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/692190d655218f6e6b61cb5cd11f2bc5/26548541741.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/vgnuuq1j813cbnlenlasqknlh4/tazutefurikosisunezi.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/vixozefazasopubig.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a71c7828ed2---zalinixitukelekatibadupi.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/22197394428.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d8277658766205157908869ed58e0f55/pejevafesudij.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160934832f28c6---93630936854.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/99178001067.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5625ab2666df40c7178dd14dfa904aa9/dofijuxegejogixet.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/jusonuwekuw.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/68034933667.pdfIn PDF document text
    • https://p87.hu/files/xugebawokabegu.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/73386566735.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202107140347247045.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD017 10788 bytes
SHA-256: b9321e9aa90502e354ff5631a7987cd017a534b3a3cc011197ec0d860fd925e7
font_01_sfnt_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 17416 bytes
SHA-256: 13f734ec2882073193302198275b31b2457a67e1ab8073a9bdd9cbe5b9a67e71
font_03_sfnt_off00012f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F23 17480 bytes
SHA-256: c19d6ac3dace86aaa574b9285325933f25eb99781013cf93a5d6cf574524e13f

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