Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf81975c266a059…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 21:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80d2334bd69906b34bf9be93b93298e3 SHA-1: 3dd87f51008b2d8d4419ba3c274c56076b031104 SHA-256: faf81975c266a0591a2359eb1eaea070092ccbcf23e2045250b51aac815439c7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://iwanbim.com/userfiles/files/60496492366.pdf In PDF document text
    • https://nyirfa.hu/uploads/files/mabonixag.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d4e34b31---51687197058.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/suzam.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/42727258754.pdfIn PDF document text
    • http://bndweb.nl/upload/files/nexenamobedewufetotulon.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614214d3d436b---96741875700.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/tazigojeminuras.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/xozupobakivorexawogi.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/pedoguwixugijelexosofa.pdfIn PDF document text
    • http://rafaelokazakov.com/file/75944586321.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/81146639203.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/74137336327.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e126bcf76a6654ea81537e9a011bb78/42093885532.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1221edacd---gusagamix.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/73911726461.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/warekad.pdfIn PDF document text
    • http://zenithmetals.com/files/kizumogemenabuwefojefixe.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/64357765992.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/13524533604.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/53968122062.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4tjt30gu0spsgslb7b2fhcp1j0/wovusesatoxogaronizod.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/41013331231.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/82262029289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+a+jargonPDF 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_off0000c29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAC 17216 bytes
SHA-256: d8a31cec3d318ddbf2ec26dc7ad37733c0b0cb7fc9b775dbf851dd99f3a05021
font_02_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 10332 bytes
SHA-256: 1d7270c38030f47e4a8660838be1fc4716487103ef5f35b594c35fd5460264cf