Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b25488cef53d75…

MALICIOUS

PDF

81.9 KB Created: 2021-07-21 18:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5e1fd7ed2b72034662cc12e1c57720e SHA-1: 75f3d40dfc3fa3383e160ef6ef831574c0cdcd5b SHA-256: 20b25488cef53d75ba6a848fdb67363f993a278e7574a43206b3633e2c0cd30b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of embedded links, many of which point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ClamAV detection further supports its classification as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/954c61f4967c09637e9e0f32fe300a9a/53059252526.pdf In PDF document text
    • http://redemaisfarma.com/userfiles/file/netuzunavafobal.pdfIn PDF document text
    • http://prosquash.by/data/fegagepasanifamobaropazu.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/83623551537.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/58177174186.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/se9bcpk42nfs6roo385phm18gp/34134908974.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b2cd17f30---75069795788.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e8e810976067905d43246afcf270d979/lamavuwimilunepen.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160830ef22e735---96607731215.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/kudbjpeponfrkbfa8i5g0pi60o/femigasibipo.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/welisavimezisijonex.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/wobefe.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ltoog39sij6pb26k0o14u0bjq1/womako.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/xevotulusumulevixorile.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/cce25dca1a20c7b2e0c97e0c0cf1db8e/jegisufenefixugelowefuba.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/kuvipupupererizi.pdfIn PDF document text
    • http://atrsara.ir/resource/files/21235102160.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/c29badc7de3c1466610ce464b4fbcfdc/92807445905.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/31f9eb9aff12922582492974efb402ae/tekivabofav.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/tp0hclarlj4431tldoq61m9fvo/kukot.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d7e74acf6---pegadofuximumeminojum.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607910f48cb41---23583038459.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a56bd935568---xoxelirujiviwelufetimos.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ca08b03b92772d65e6ced116c1a6fc42/saxubinagof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=titletown+tap+roomPDF 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_off0000dcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBC 10296 bytes
SHA-256: 329c0eca66a149e04aa9a9878b5fa5ab81bb7a34bddcd4eba485ab87b5963032
font_01_sfnt_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 17360 bytes
SHA-256: 0ceb486fab2695fe3790a8012b74bc68df5cbe1507caa29b2fce48ac0c86434c
font_02_sfnt_off0001216d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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