Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b646658da2c2fc…

MALICIOUS

PDF

85.7 KB Created: 2021-07-08 11:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 41e7202a822f0aa4984b2811edd43a55 SHA-1: 1466063df848eeeebb4d1bbd3b20d35934c35e52 SHA-256: d8b646658da2c2fc4bea3e42b76502629c278d1a7caaae36a07b6d81a23c7595
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to numerous compromised CMS upload locations and disposable hosting sites, likely to obscure the final malicious destination. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=iphone+6+user+guide+pdf', are designed to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://allytemp.ru/uplcv?utm_term=iphone+6+user+guide+pdf PDF link annotation
    • https://tsegypt.com/file/20409390436.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/45501743915.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d3c773bcea9c0da5ac137bb01ce941e6/34470076694.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d8c94a4340478fb274b6a244b92ce8ab/47220992222.pdfIn PDF document text
    • http://slsnn.ru/content/files/kixegadamomejado.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/3826067007.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/88302684916.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077af5c9b86c---14387922721.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/fenilibuwoxegepufakuka.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/28293f8879a9596aba41e766b8cfb68e.pdfIn PDF document text
    • http://didopack.com/files/83544413637.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/964ae4c911bc34a2f4f692bfe6a3345a/3443427626.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/56255062538.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c17cca6cb9b---13263597417.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/fusoku.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/elnctk9u375bqfpo1s3lnh1suh/54116923489.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c6a3cd729---65259595166.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1635271e54---92532358560.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a97f1908410---dasogafunipoloririzovage.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/58876608069.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://ludifrance.fr/userfiles/file/24729269279.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_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 10692 bytes
SHA-256: 371f9b9a1db0d50b7ca8d6c8920998e17cfbe35d5734dc6ba8776d7607a2c4f5
font_01_sfnt_off000102a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 17912 bytes
SHA-256: c0091b52941e5cef278f2c8727c09dafdd10ce959c6bccaf73729e8a7b1cbe2d
font_02_sfnt_off000131c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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