Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5aeb4c36bf9a3dc…

MALICIOUS

PDF

88.4 KB Created: 2021-09-20 23:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8cc0508e7ca64faaa39eee2992bf945 SHA-1: f1b3c64f68d8d52c79bb4c32fe3cc4ccc6442732 SHA-256: a5aeb4c36bf9a3dcba746e6f073fcb6a0cec6ef74294af82692f05db353f1512
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external URIs and link farm patterns, suggesting it is designed to redirect users to malicious websites. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://oniceh.ru/uplcv?utm_term=lego+movie+maker+app+android PDF link annotation
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jexowufaruvirowot.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210910/files/20210910101304.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/57944517347.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e235ddeb5f---17262911442.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/434i9smqdsudm9o4pkcfis5r23/manivuraruja.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/zezibukerezowipi.pdfIn PDF document text
    • https://fratellifurloni.it/file/46342555036.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bijarowuregejosevov.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/zereguse.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/64046285783.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/31449573650.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/11033092026.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137842e8328f---1785878123.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/174bf1759ef889f06042d07a61eaa1cf/xorabobugodezatiz.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/87304306236.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/23694689812.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b49708d61---davonododutijedir.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/sobibogivet.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/9154876454.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/jigapewawegifowexirudut.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/tukafibunigajuferoz.pdfIn PDF document text
    • https://proia.bg/userfiles/file/68850772695.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210905030051.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///13454844433.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/liwajejorijalo.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/jalenifawidibob.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_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 10536 bytes
SHA-256: 53e0fac91872bd6fae2a12989f0931c8213ee217049563b74457111199c95228
font_02_sfnt_off00011c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C45 20476 bytes
SHA-256: 269f9f5a9057d0199068ae66f1b8415aa938c63a42c352c407161991c3169d3b

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