Malicious PDF — malware analysis report

Static analysis result for SHA-256 6342557275515cb3…

MALICIOUS

PDF

75.5 KB Created: 2021-09-15 17:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e9c50412ef6a18a41d43a21dc359dd13 SHA-1: ef0c5282d339f94c49a4d0041a1f6cf4963c7e45 SHA-256: 6342557275515cb302c06e5cd2acf32c988804645c576dce3a870e6eb824cc5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a malicious intent to redirect users to potentially harmful content. The ClamAV detection and ML classifier strongly support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=roald+dahl+10+short+stories+pdf PDF link annotation
    • http://synfarm.com/upload/files/76598396274.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/7618718375.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16130e846601d6---69355412197.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/70227599117.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/nomebapisazavopo.pdfIn PDF document text
    • http://lachina.cn/upload/file/86176105172.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/61337465955.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ca6dad22f5ee184e435c852932fd5beb/23623912924.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/55210534125.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/32681147362.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613c32571d085---98445337174.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d318a3c2b---3679750412.pdfIn PDF document text
    • http://liyangah.com/Upload/file/zasejogagulikob.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/27587920055.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/peritelunawoxi.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/togenarogobisadosipa.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/58857677195.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/fl0k98qegpmdq9buuslnm0nqon/lufuranolijabawasitu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b89ab654bb---xisolibajefimekapon.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/11481328150.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109082022014662.pdfIn PDF document text
    • http://metapolar.hu/tmp/51552706239.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161410fa418e70---rimub.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_off0000c1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 17568 bytes
SHA-256: 78b07a1cae95a7aadc1f08675f8dac06a6fc9b3f42beecf5131a3ab906abdcb6
font_02_sfnt_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 10708 bytes
SHA-256: d52b22e13d5484497b95f7404e6b774ba53361c16a3c43584b10e28888e92ade

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