Malicious PDF — malware analysis report

Static analysis result for SHA-256 586ad77e055f3d8f…

MALICIOUS

PDF

98.3 KB Created: 2021-09-05 17:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 327ec0e9e0e5edbdf35de3d5c806d1c2 SHA-1: 8d93962608d1731b012b9dd32bd0af0a266746dd SHA-256: 586ad77e055f3d8f124282d2cdbbbd7db37760dcb54128bf1ab4805470e92e91
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. Heuristics indicate urgency and invoice lures, combined with a high ML score and ClamAV detection, strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pistant.ru/uplcv?utm_term=lto+exam+reviewer+english+version+pdf PDF link annotation
    • http://adamlegal.com/userfiles/file/xazetuforinujawulor.pdfIn PDF document text
    • http://yongqingtech.com/d/files/dolumomadolimivewobagupez.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/vojaviwemufodizivad.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/wemuka.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/53752663731.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/60300792725.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/pqf4j3h6o4knelvt36i6097gi5/doxojesif.pdfIn PDF document text
    • http://katachizu.com/img/news/files/45101868107.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7ff69a32---gasezitatefufezafoxaros.pdfIn PDF document text
    • https://t2sc.me/userfiles/xokewusol.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dddc16f14---42768567897.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d5ff1e9ec48d2fdffc213bffee1bd919/tisetakalopifavaf.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/nedojiben.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a58009350ebf1bf81cbe88fd2fba6fa7/wexifamiliwoxom.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/61345904521.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/galozozowagotevugibopezu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f478508f0---21384644176.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/zozimu.pdfIn PDF document text
    • http://flomojapan.com/upload/files/vamupofaxesolu.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/rusawofafobobolodilano.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/12925360435.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/4913693152.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_off00011946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 18488 bytes
SHA-256: d3296f7bb255c82e639fa22a946dcbe7c590b1ff2db9c6c247f4a173b68bcd7c
font_01_sfnt_off000149d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161EE 11156 bytes
SHA-256: e57c0ca63ea876cfc567d12e41565c0a689f0981ee7418695b0ee3c06a395b8f

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