Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db957b608c3d7a2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 06:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a9d249fd55794c634db29a99a93da14 SHA-1: 7f5354e2f9c424657421b538ed6de45109a67806 SHA-256: 0db957b608c3d7a290f198be5966bc023c8d4fa48ea634e30736d87a650e5b9d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also features a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of JavaScript and the link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=shareit+pc+to+ios PDF link annotation
    • http://pure-chiral.com/upload/files/62250105114.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/36815185887.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/rukanemo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1d63e92f4ca3f74f1097b31360a261a3/24993141645.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/16595142778.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f27ccf699e55b73abd2bea06fd11aeb8/velefonubiber.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/ruvukoko.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/83080733199.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/jimovagigi.pdfIn PDF document text
    • http://tano-cable.com/d/files/latukururuditabiduzusidux.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/31603187982.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f2ca03734499d7cfc5ef355abe04759f/81607160558.pdfIn PDF document text
    • https://beautydent.hu/editor_up/zakezulagakiwotew.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/pozufidexizawa.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///kajavosiranu.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/20041953676.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/76080898184.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/muripuneledevik.pdfIn PDF document text
    • http://koddous.com/userfiles/file/fiwogure.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090717121973499.pdfIn PDF document text
    • http://119pump.net/d/files/39176366290.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139507fe5b50---fojopovap.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/baxukelumesuwebakiwom.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/4032853543.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_off0000db05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 18536 bytes
SHA-256: 27bbd4fa4b4dd54104dacc42b91b96e64de060ea926b537286b42bc9a47eb290
font_01_sfnt_off00010b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B77 10396 bytes
SHA-256: d5526615313c078cc4baec8a4d94834d3fb000987e18d63d37ba1d0cb6e35021
font_02_sfnt_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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