Malicious PDF — malware analysis report

Static analysis result for SHA-256 af632e3c13e36570…

MALICIOUS

PDF

75.2 KB Created: 2021-09-04 14:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96f375c70f4eb64573ff650e59160e28 SHA-1: b0b5d548925fd895896a069d0490fbb30f615db5 SHA-256: af632e3c13e365707576cdea3a125888ed3ac9e8f3f93e0b9cf6ad9f56daf03b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting. These links likely serve to redirect the user to a phishing page or a download site for further malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://canadanur.com/resimler/files/61210705024.pdf In PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8517d3484c---29205993120.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/12303275485.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/dc27b958521bce8974c54d0878c0b112/75767911678.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/zujibexexekum.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/posevevowinupeve.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d71819f64---nokovifimakifasovoros.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/wajelodoworadiwamemunik.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/51258274792.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/59979276223.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/lujot.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/guweduxope.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a393776a8d3---79236418347.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/buzowuligudajomuridumab.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/33319334204.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/gikixoxuvivedegu.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/36535965832.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/20868446875.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/xojoximusazuvanuzoj.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/tuwofogewokokalatipamana.pdfIn PDF document text
    • http://lucann.com/Upload/file/xogalodusevasagosupuniva.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083328c114ea---76350125841.pdfIn PDF document text
    • https://baptistfriends.org/media/50387737590.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611f2cfd82c49---dugezagivawakemof.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/12use1cnupcgplimb0ici0qmr4/xupizipi.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0e677559c36f86e61eb99ad31b86f6a5/kudikerowemolagob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=facial+nerve+palsy+treatment+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_off0000c3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 16464 bytes
SHA-256: 87efec75f5cdee61e182b5c74a1604b54b6953b506d8395ac849dca26f409069
font_02_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 10820 bytes
SHA-256: cd73c82751370443317587d05b1da5f7fb3fd3c22b504180109820df477d9a9a

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