Malicious PDF — malware analysis report

Static analysis result for SHA-256 542f9043575b816f…

MALICIOUS

PDF

108.3 KB Created: 2021-08-04 18:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 725936a50984442885c031c3a36b2771 SHA-1: f22875cd029efd6addc4fe5bd2e671de87249c4f SHA-256: 542f9043575b816ff3320b6d76590ea3f7856ed95347d8f759b8e5a61d036314
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://phutunggiahungoto.com/uploads/files/64510011344.pdf In PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/cg42dkusekondr3pi38uihco96/35750605253.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/4d4h1kolha8fi4d7g585606ieo/xatozof.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e455af24abf30e2f7f8a299b8200ff24/dosix.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2f278249---tuwelemisedujoxa.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/nogukawaneb.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4bff68c0e---45278088934.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16093b45253645---17126376558.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/18bd400fed8406282101b8b250c369f8/zakegegib.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/79640768760.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/45015426887.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8e80b363f01cf8e9380e7e44732f5ce9/menovog.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/lanalo.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160723f262464d---8649629021.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/dudowadosunitasitoz.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210721_061406.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/aeb7dbe76e914343208dc4ecfc4afecd/25937762875.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/s27i1gcjdrma0dsbnhh8o7iiuv/gazazafesanulisoliv.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/82286444802.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6be49369a7---72902900776.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/fanidiv.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1644c821da---bosumosakutulagubiranewaj.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/18790548806.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/2pkanvipkfl3ojoadpkqr2ftes/lokuvavuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hogan%27s+heroes+guess+who+came+to+dinner+castPDF link annotation
    • 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_off00014316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14316 10980 bytes
SHA-256: d7dd67792e8e4ff121bca3e235ccdf6f8a17af80a21efb0f0fe164b9ea0b1396
font_01_sfnt_off00015c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C49 17516 bytes
SHA-256: e28cf53d454feb4e0572c771f850b690ae99edb70a00209b1669c395f98ba503
font_02_sfnt_off0001891b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1891B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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