Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc43704c7e9391c5…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 00:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0854f7028def4b67f910a104a7f6c809 SHA-1: a64165e4584213dd7a788a6fcec02ea4ed5280cb SHA-256: bc43704c7e9391c544c0853eb2c9515f128eb4f729b9519361a8051a9b75595b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload storage or disposable hosting. The heuristics indicate a link farm designed to trick users into downloading further malicious content, consistent with phishing or malware distribution. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=moto+x+play+android+10 PDF link annotation
    • http://bjhtdszdh.com/v15/Upload/file/202196858388865.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/fetuputisaz.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/51496302353.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/lenaji.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/041726105627.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/95434624088.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/wapiwalinonosir.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cb43017746ae73164033dffc90b6eb7f/47118266126.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/78147132624.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/52768190568.pdfIn PDF document text
    • http://erex.hu/upload/file/58755416872.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/45607786328.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210906185852.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd6688ee1---27661153436.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/sudejibamorodefaduto.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613432e0499d8---rewakipigetazojafi.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/19168901236.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/75492461736.pdfIn PDF document text
    • http://centronegozi.com/public/tomolesikipivun.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ro2siimak0r6dfeh8239tuslru/34021752033.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/dutenufarivaf.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/43295278296.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_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 18284 bytes
SHA-256: 1f5fa7014e5224c9a32546db534fcccf8b17de5a789f1f7c8fdcd185d980a097
font_01_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12746 10468 bytes
SHA-256: 06f801217b8d73589842ea282ce24329529683d485fd9bf86b9926810d5b9a3c

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