Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4769f5797f3b8dd…

MALICIOUS

PDF

102.2 KB Created: 2021-07-20 12:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1047aded7076eba8884e249319847437 SHA-1: befe560d9424496b71e126134226ef195a786014 SHA-256: a4769f5797f3b8dd9accf6ce52117b3b03b866ea06fe52fd1008703ab3bd7acd
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URIs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The primary attack pattern involves luring users through a seemingly innocuous document to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://iqmuseum.mn/uploads/files/nariperusetipewagujas.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e335c62b---kijujatadizopod.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/4eq69prm3f8hss5nhv4fhjtc7n/12732520530.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12f532683f---fukofuvar.pdfIn PDF document text
    • http://metall-press.ru/files/nevil.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/67597790045.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/bavuguxijosobagos.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/90931446295.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wewotanuju.pdfIn PDF document text
    • https://parc-hotel.info/file/xozewutunedofozesulavilis.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/deluwugol.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f9dacc404e0be8c61f68a28d3f078f00/janumowuzo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160784c021a46a---53459276163.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/9e58b7da42f3902ede810063dd977c44/xuselanavatokiduwefakaw.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17e46421f---70368657135.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/80454600379.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/pagesosedumikedimidozojaf.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/2seluc26jdsmhqn6likq5uufp9/jalapares.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/vodafupanemiserukoxotos.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/35da785edd7232a1dcd8ed57c2230813/gafutanadiwasivipi.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/xegexo.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/28qo45e11pnl9b5vlq2klsls84/69387173199.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a02928df4b9---vipil.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df75594d65---tugatujajetukebinusat.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/67994059605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=billy+ray+cyrus+and+miley+cyrusPDF 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_off00012dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAD 10580 bytes
SHA-256: 07a7823cfd467fbc1a49c407881596e590c543b62980942c1c73fe9556fa2939
font_01_sfnt_off000145ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CE 17360 bytes
SHA-256: 3b0c76152f2248e089954c6cfd1974615319f7ad5658aa3330d9aa45451b5483
font_02_sfnt_off00017369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1