Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ef97515ca92596…

MALICIOUS

PDF

95.3 KB Created: 2021-09-04 23:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dacb516fff73175d51888fef67191527 SHA-1: 56defc63dbeaa7c5bfc925c91bce9feeec1ff92a SHA-256: 53ef97515ca92596b2b77a772c630f845c3a181d99d13fe2b116ad0c9e30f0a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/55672552933.pdf In PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6df3b16cf14a05c4f5f0bab0dbede0a4/lodepomef.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc22a76422---78838248877.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501211445846175.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/92701770389.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607393d8ef6c9---95435849104.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/gexiwepuj.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/920e52970efaedec2cf76d4ef832f2fb/46228838277.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/d787fdb6eb6bf7c2394acf6a61407d0c/59843226986.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106201012.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/10709174801.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/fejexezawibapiza.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/07ee7353d5b49e8d9730aaeeda7d8c0b/faburew.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/bf1b964233bf6d04769db4366d49dd33/18452406697.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/2b9m9bbt1ek7lod8em1edjnt7j/pazozarudesofusedera.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/zikizugatetukezub.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/3001043407.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/kupidanuxemufisomug.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/88600909333.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c9e720a5a---14983390090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=object+oriented+programming+pdf+filePDF 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_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 11088 bytes
SHA-256: e07546cc24c9141f309ab0801ee36582a44d51e758390a6855345caa730aa76b
font_01_sfnt_off00012851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12851 18136 bytes
SHA-256: bbaaad205507d186f2ac49d72cb60a4659118e19a88bb4590bbcb4118c206866
font_02_sfnt_off000157a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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