Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a2b55026e5cb42…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 19:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29a9edbf1715ec441afd2e64aa538c83 SHA-1: adc64efc1b8829208bb0c39a235f654afe8109c3 SHA-256: c0a2b55026e5cb42065669eff16215dbb026f4a6c69629a7c30591170646f653
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicative of a link farm. The presence of embedded JavaScript and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware. The primary attack pattern observed is the use of a link farm within the document to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=watch+the+boondocks+season+1+online+free PDF link annotation
    • http://self119.net/upload/userfiles/2021/09/files/210913170451.pdfIn PDF document text
    • https://rjpexport.com/files/32752015581.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/tukufoseferu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/udo9usanfvtr0o8av66v923r47/nefikerabix.pdfIn PDF document text
    • http://hmed.vn/upload/files/wamurijekatatiri.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161310ec02e162---govemakosivatu.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/33983417301.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/92441751371.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/49703752687.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/fenerozisozof.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/24341030440.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdac609b67---zolajexururajoxelav.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/zodavinanuwakageda.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109170221242216.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/42873270820.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/1994154408.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/jejolowavetus.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/muxunexusod.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/leliru.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/matinurumesawevi.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091121100454.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161407e3c0f0fc---21672729686.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/megelirumujew.pdfIn PDF document text
    • http://goldmustang.com/files/files/17312386460.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/263163479.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_off0000d922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD922 17080 bytes
SHA-256: f0b57b5ab673043452e8c984a99fb81f018426fdedb16399db4310114af75511
font_01_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 10848 bytes
SHA-256: d92cf388c1aa33ceab8d237cf66b5556964a23fef887b59b95e446e1f58641e2
font_02_sfnt_off00011ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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