Malicious PDF — malware analysis report

Static analysis result for SHA-256 93383581b103fd7a…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 04:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c309ccad9ec524a6b6c8cc9df9622b53 SHA-1: ddfa05c84bcafb8f666b75c8fdfa7bfb93f5be0a SHA-256: 93383581b103fd7af9092143655203a172beb30c6f4e58369e9859c8abef6950
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external links. The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the execution of malicious actions or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=download+insta+up+apk PDF link annotation
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615382bc7d046---19094344991.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/83960922222.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/wirazedorikevajujev.pdfIn PDF document text
    • http://zuche0551.com/upload/file/botisexilububifabiwanufud.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5rghu3p9tsveeje81u2ofnp1mj/95336794572.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/1285513837.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/67285678612.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/48533109742.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/muxefafa.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16153acbea90da---simifasujed.pdfIn PDF document text
    • http://xn--evdebakmhizmetleri-k0c.com/uploads/file/didulegilo.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/76296470739.pdfIn PDF document text
    • https://dom-titan.rs/files/20070152318.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/gizironafadeginug.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/punugetefududufakopo.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/musezafebuva.pdfIn PDF document text
    • https://verner.lt/images/files/19228670970.pdfIn PDF document text
    • http://uco-kampen.com/media/files/baxisopiligugukividitafo.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/62377884525.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/wodisivutipupature.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/3176946522.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/53343290398.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/19995209613.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/mumisiwij.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/d2id089t2tc8jj1ntid389tbcl/57335026679.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_off0000b384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB384 17060 bytes
SHA-256: 05f1decddce7c2869856bf78a54693732b81019f9bba21839fc2df27c2539a86
font_01_sfnt_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 10432 bytes
SHA-256: 3e95a44d8f44a984840963566edf2cfe11746e864d83d5f67f525ee2d994eeb9

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