Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e73fc2d8c9e7a20…

MALICIOUS

PDF

79.1 KB Created: 2021-08-20 21:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 44a775b209a825466bbbe8d5996c077c SHA-1: 520265c9a1794dac8d382064cae39df81d9a1ffd SHA-256: 3e73fc2d8c9e7a20823070f65c381eefe983983cbebbd24bf0bc0cec5536c4a1
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 upload directories and other disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pistant.ru/uplcv?utm_term=fort+mcdowell+bingo+hours PDF link annotation
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f08527be590---baketetinuna.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/lojazubosara.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/11294599976.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/xujaz.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/76309672930.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/48528764951.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/bojejurozigevirurubanofaw.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/58544545709.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/27920628204.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/xowifinivuza.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/16213081749.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210626071114.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/84183595448.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6dc747435---wapurezujenuxefe.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608901cc4d783---48940836930.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/xelitupikud.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/c9f6db33bd3df49b2b13b23cf3a81029/disasazajibobetosu.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/wodotimidurexexebepitadij.pdfIn PDF document text
    • http://asustainable.com/global/file/2902857054.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9dc262f2943ab582ff6daedb7f3b326b/23889720188.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f32c5bd9a---figiruwuworu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5e63a50e---kegerebixebu.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/kogopipuxoxig.pdfIn PDF document text
    • http://ahchala.com/img/file/jirelisekofiwidiki.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/90400ad3c398099dc43f01caa2075c1c/384967310.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aca8c755560---25675867953.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_off0000d2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CB 10956 bytes
SHA-256: e199bd3723f6425eb37259c59c5a6f73489d01cf8489618ef01409440880367d
font_01_sfnt_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 16412 bytes
SHA-256: 2e0689edcec2b7cf9ea8b38f50640adafaa6e6c5f32368b72f74331851390329
font_02_sfnt_off0001166d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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