Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b92b75eadbadc1c…

MALICIOUS

PDF

82.9 KB Created: 2021-08-10 10:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5241b68e331b12b27384261e3b86b3e4 SHA-1: 17e937b7b567d679123e08ad6ae80c0bd2aba314 SHA-256: 5b92b75eadbadc1c8b93a3abbbd70e19fbfcc59de33b0ed91ecea28ca2f9b94d
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various URLs, one of which is a download link for what appears to be game software. The presence of multiple links on compromised WordPress sites and disposable hosting suggests an attempt to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=dragon+ball+z+shin+budokai+ppsspp+game+free+download PDF link annotation
    • https://laurallo.com/ckfinder/userfiles/files/40185652380.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e95ls6cecd1alr77j622f7c11/28284367800.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/zovajelujemidorokaxi.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607af585569ba---50105373961.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610657e2f0036---tekutagixetevaxirifikodu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160778a27e6697---wibelatafuwire.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/wixajuzutojifadulo.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/15285581206.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/zisapijawewedexukazox.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/55165912392.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b05ecfbf33800f31ee1d4a742203aad7/42883426489.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/32731335480.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddad9f5d336---90603949004.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/67400171609.pdfIn PDF document text
    • https://www.jedeminute.de/wp-content/plugins/super-forms/uploads/php/files/qf94llqf5253rt5q71be2vnuhd/zobamuxezibugiwetewede.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/sonatiwobarupi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16110e2877cfb0---53428957427.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607844d612fb8---mobozekirawo.pdfIn PDF document text
    • https://andana.us/files/files/bukigivixozig.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/15773603626.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160728d837d9e0---55771808126.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/31325973466.pdfIn PDF document text
    • https://europartner2.pl/uploads/wozofamutodejeruru.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/mspormsatu8hlkj0phcea0cc6h/22638413913.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_off0000df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 16848 bytes
SHA-256: ef73424ba7cce8d9b23d200ae538d8a6caea90aa0161ccaa07398d900e8efe18
font_01_sfnt_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 11328 bytes
SHA-256: c8e254ed635de7596d70bb40d0b3ddf482f2387f2e676caca4825b71cf27fcec

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