Malicious PDF — malware analysis report

Static analysis result for SHA-256 377d47dea4538292…

MALICIOUS

PDF

87.8 KB Created: 2021-08-10 19:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 6d62a80a0513c84b5d266f3ea95ed127 SHA-1: 4d751bd6ff5036f98a775e8a53664c940330dd42 SHA-256: 377d47dea4538292dcb04bddcba9a1c31d03e259ab8ebfaa2b44fb5c71559060
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://allytemp.ru/uplcv?utm_term=calories+in+1+cup+flaxseed+meal PDF link annotation
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2acf18c21---nenev.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/a09ebdf84a104daff27c2b3f00f417b7/8721219213.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/15787319117.pdfIn PDF document text
    • https://bor-diing.com/upload/files/nevisazolog.pdfIn PDF document text
    • http://snsi.jp/image/news_file/51228209220.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ba2d01d4f---kakor.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/ledasasogekavujije.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1b4152f0a47b34e6174a6f9b15ec368e/fadiwurakabopolanaru.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/betoruxamewerawureju.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67583f0ba---luziwalelejunakazupofokaf.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a109ab27d4d21b32cad66737ebe763bf/bevagupivo.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/95654752156.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/73658986832.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/wulatovasagowiseduvesej.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6a76abb82dfa0ba155e4923d24b14433/11074873404.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/k8699m90g3v4b6glips7p1dqr6/82524576022.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/hon3k89hdgtriqmgqifbckbbj5/57519035373.pdfIn PDF document text
    • http://aimic.com/userfiles/file/3918486187.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f18340ab307---24916183425.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/vofiguduwa.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/t0mbjho0r35iv75mf2hatpr626/lorabikuwepejojop.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_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 17868 bytes
SHA-256: d2b98e01d8aafade83caaf34d0694258fe56c21d242faed808c3f63b77e2cec1
font_01_sfnt_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 10968 bytes
SHA-256: a768f22e2578e95c382877842ea9ef735e6169e27c07562e9cb2a67957e4029f
font_02_sfnt_off0001391e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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