Malicious PDF — malware analysis report

Static analysis result for SHA-256 407a9dd11448ae8f…

MALICIOUS

PDF

94.5 KB Created: 2021-07-13 18:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 79506d89a78300197cf417836fe26a1f SHA-1: 23ed5ca5cd3486feb9e191b54b9f39e03f6015ee SHA-256: 407a9dd11448ae8f31b4d2a784a2a027e67d379b5c03b597d3dc697831cbf73b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, distributing numerous URLs that point to compromised websites, likely to facilitate phishing attacks or further malware delivery. The presence of multiple compromised CMS upload links and disposable hosting further supports its role in malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smartpaintingplus.com/userfiles/files/60176613125.pdf In PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c584925dc70---zigitarajojiniwi.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/33539469734.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/7d7e3a26a2a0ea045ef4b138154b01eb/nigeletubado.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/5512455899.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098b34a5b135---29383471693.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210511195513_53035670.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/33930605949.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/33369581103.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c933d7be316---99046301454.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/fezokitimona.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cff209e8cb---16211220819.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/xasunefaxog.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/b97d6d8300187a7e70a82bdd7dd5124b/wupefaf.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/sasinuwumiruduxuwulikapu.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/ruxepi.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/pigal.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/zanudemewavobonemu.pdfIn PDF document text
    • http://canadanur.com/resimler/files/33860355352.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/4e9304a3d85184fe8e9a002eef27fd7b/27949259001.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef34fe5191---82452582992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=i+think+we+could+be+friendsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 10780 bytes
SHA-256: 83470d81942438716d576eed3470b71d6b7f4892352dd14d4e606482320d74b1
font_01_sfnt_off000126a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A6 17680 bytes
SHA-256: 4821a21494be32e5ad9793fbea2b75687d34cfd45c90d24bff657048b8ef387e
font_02_sfnt_off00015530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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