Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c90bac6697bb9a…

MALICIOUS

PDF

90.1 KB Created: 2021-08-21 22:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c20709e021d183fb9a8dd6fae35926b3 SHA-1: cc9588fdf1a88ef074cd1d12a650153608a6e70f SHA-256: 90c90bac6697bb9a1d12a6fc01de1bc93c5c585900b7d2dfe81e5f7e40640cf5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the malicious destination through a network of disposable or compromised hosting. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71263815765.pdf In PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/376b19f58e07f5cce861cefb296cb16d/19989725806.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/naretidima.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/44428162347.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/visiwepawasulupusi.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/62112497827.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/vizubajamajar.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c36037aa0---niguvododalatotisizivape.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/pujimuwesezegilep.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qkut8m7tpgje7m88548m4elsih/68219384666.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f3de79f9b---99344622981.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/56420424055.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160acf0c68fda9---wusajolugidibiv.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/romixabizo.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/74e45b99d5e1488097582e1de0fdb0f7/15967324950.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fbbd23c40c---73040618780.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1610b7b15e2333---41272259630.pdfIn PDF document text
    • http://goldmustang.com/files/files/kefuxojawopaturagikokowen.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/3428008288.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a9225f7501b---29739396641.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b960c1b4cb6---pigolazalumanufulusu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/93jvq98tv59memidc59g6vkaec/97080448973.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc43e28995---bolugelopexukewatukes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+gta+5+android+beta+versionPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 19496 bytes
SHA-256: c41e2374de678091a6112abd56f8fd3a1c04b4acc6f7f3721bf6b58dd105ecb2
font_01_sfnt_off000111cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DE 16188 bytes
SHA-256: 43aaf6b7257293a9fb3df01e9826f837cf2b9b92f506adc28ae8aac51b7d6941
font_03_sfnt_off00013f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8C 10852 bytes
SHA-256: 43945d87cd3405b86f0bf565c0a019007a3a554800d0e1ea02292f495380e571

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