Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d1d744a598ec06…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 02:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abf39852458ce98b74db329a6a498920 SHA-1: 7ec7cf74e76ff65d0e0aa90349acec3e5c26b15e SHA-256: d5d1d744a598ec06608c4b9e261076461809b26f67cf53df6db4adbd0d4b9955
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised CMS uploads or disposable hosting. The document body is unreadable binary data, suggesting the malicious content is not directly in the visible text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://bogelaipigeon.com/upload/file/41923285606.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/288851d0b5e546396de32eceb2a0a6ce/50956099319.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/54096491494.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/29920688913.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b2558b2d4f3---74109537644.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/zakewefiwu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/e38eia57apkp6neaj6p6l41jf4/95021935862.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/87653516144.pdfIn PDF document text
    • https://actorconseil.com/files/file/88153176750.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/1229a1adc1b7c5b9a272f359b56f85b4/zelawup.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/jotapowo.pdfIn PDF document text
    • http://paliukenas.lt/i/File/fazubupoworawega.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/98120326099.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609451493caac---beruwa.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/cac9d0badea4098fdaec902744c028c8/wexifikuwab.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/80615935619.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e2f49f4560a2210152b22c18fd75beba/rigizapesokib.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081071a1f2e2---91079630572.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/78947f9a6e9b00bd33fdf75f84fe0f62/xoxusurefizutupefe.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/18395126006.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/75580786601.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f42c75395---suvegoxukudak.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/jiporetinakajilezuto.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/3f2d86031f784eea80778210d01b76e2/rarejida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=conditionals+exercises+pdf+3+esoPDF 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_off0000cef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF6 17796 bytes
SHA-256: 53a589f4346b9e28297fcebb73c80f714bc6ae844c5574579b0e3459495f63ce
font_01_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11565 10920 bytes
SHA-256: a5c43dcd7fcff39cfcedc20d309fccb8cd43b5c3178bb81c5d855d7840368086

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