Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94449b033cecc23…

MALICIOUS

PDF

96.8 KB Created: 2021-09-07 04:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: afff63d9f105ae9313ffaf7a58991626 SHA-1: 9b7f51b3fee07c6bc414e890310ee9e153daacc5 SHA-256: c94449b033cecc2331d7dc3c9b3d70fb3de9e09927988c05eb6fa918a5870623
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm on disposable hosting further supports its use in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://eagle-aviation.com/userfiles/files/14123901295.pdf In PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/43301860847.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612c958f2daa5---96307612308.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16080cc1830e3c---zerakogodulijivenewarij.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/8ed30v90tg44ounkkv9na49l76/xijirulupuduvudifabokid.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbfeab15e7---11916339969.pdfIn PDF document text
    • http://954move.com/clients/4890/File/vasotiluzowezuzesetewu.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/wuvanuwolabavudavonisa.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/wugomewatesunazikapobajus.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/81923911043.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/pesovenugixevosep.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/27a9a43365628cf8aed9e88d1dd25e15/zizelaguxirujujurasajofov.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/27981628539.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/51b1cd2888a9474332e392e03be239b2/zudatesunadoxub.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/27645260209.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/zebiwunagixupunubabopore.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/nigafizulijadexas.pdfIn PDF document text
    • http://vodnik48.ru/content/file/fegifuzu.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/9084508231b1f5460ee3b04efa0faa79/5742924254.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/babenazid.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b06311dc41---lotufetu.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/xokigejujanarapizamom.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608065ce4841f---14792081154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ibps+rrb+po+notification+pdfPDF 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_off00011476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11476 10524 bytes
SHA-256: 319d743045c2afe1306a67314f68d6b6b83f7b657e1be31c789ff2e350c7f5d2
font_01_sfnt_off00012c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4D 18788 bytes
SHA-256: 98cd5569d1dd32695ab47c2fb119abd91030870b6a48933554462d79b9d2046f
font_02_sfnt_off00015d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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