Malicious PDF — malware analysis report

Static analysis result for SHA-256 233a9b41afdeadef…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 03:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bbf0c613c025476184f8bde8abf111bb SHA-1: 7c2e87124269161314f8b33d6599ec792817d3a5 SHA-256: 233a9b41afdeadef92fbbf1f679ae91947c9b2adf4fc627e816b3fa66d752e45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f080895754---42489682075.pdf In PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/d27ucpbbhs9rhp6eoinb2ci5e6/27640101814.pdfIn PDF document text
    • http://hkwwta.org/userfiles/52324193205.pdfIn PDF document text
    • http://taociren.com/upload/file/2108020156506360017t2oiypehlco.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/95782775025.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3e0b86bc0---55700514809.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2b149f891dab707799ddaf29a65c43d3/79696124182.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/9b48c8ebe4fa48c39608945ce984e0c8/kanuguxomojutageg.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///2178816893.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/18389714754.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161293eb17cd29---63353535981.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d40378ab9e---54426312359.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/lufejexovid.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/gasudifemiwisojuralonej.pdfIn PDF document text
    • http://honda-vo.com/upload/file/39664823821.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/zuvolufiwibarexise.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c17c376bb55---kajajabofenobuk.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/nefofuwemulujoboja.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/56990485611.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/fekaxike.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/81202690258.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/57333410394.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/27322409288.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/7238300997.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e8bc910ca---kemano.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/66247744776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=star+signs+taurus+todayPDF 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_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 10536 bytes
SHA-256: 64f7afd547fa4fd7c7eb91d38376fad2123b1dd1f87b1001e8cfaac0ae4f2f32
font_02_sfnt_off00011537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 16564 bytes
SHA-256: 0e6349c664cf2b9b146f5b0205023cd39ad99abf8c9735231a75f569a1ad3e27

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