Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdf5536923c9173…

MALICIOUS

PDF

90.6 KB Created: 2021-06-28 10:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 801649dea1654f7bfdcac2380a76c8cc SHA-1: 363034f91758f1d821c4448a848ad90decd582e2 SHA-256: 8bdf5536923c9173784aff4578df766faffd4872d275cc450acefe3d58e43fff
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model with high confidence. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple suspicious URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc24499ee1---74321634246.pdf In PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/ef1a02c14556ddbec5b182e337d862b0/gorades.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/14064846853.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/lotavizubanavubujuw.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/futuvobapujeniw.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf360fc2a21---lekopomawakumuxadusedi.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//dapojazax.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/eb23cda5aab33d9bf260d58436503e73/82413925498.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783f0315720---89830641875.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/hdgegamrc1an4u9jg8nk85sk65/laxivagizipoliluvitatabuf.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/tikev.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079818cea4eb---41080070070.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee8ec00b9f---85579684954.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6aaed7e47---69684117663.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b684fb64c7---17874338614.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/8627135492.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/139724989609b09053a9a7.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7cd3aa7ac2ae35daf17e1b9b39346886/wufutewidebivarenasiw.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf53daabe8---73084653821.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca0ad9da63---mumakofopumenopiderarami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=uses+of+clay+triangle+in+laboratory+apparatusPDF 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_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 16784 bytes
SHA-256: b6906ee5e8be9e5dedb8a841d9f65ff4a7ac55b744f8677bc6471722b6cc901d
font_01_sfnt_off00012bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C3 11016 bytes
SHA-256: 8d2efe0c97661c679b9f2bbd2eedcf16c6ee2eb6877030ae32a1261b4d9c5e5c

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