Malicious PDF — malware analysis report

Static analysis result for SHA-256 8173892799af2e39…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 00:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 889de2ee29c434cbc24dbe618b6e3ae9 SHA-1: 44f7395a8cbad3d97b74b0b3e82b02ed953db2e5 SHA-256: 8173892799af2e3996b5fcaef195d3ce60da4dc02e302d02501dc46c50003cef
96 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to direct users to malicious content or phishing sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918aa38790c---10599173980.pdf In PDF document text
    • http://straps.by/ckfinder/userfiles/files/jinole.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b8579e87db3---48376347845.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/e55el4ppp7cdh01o1s3h4pkoc2/76899939711.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ba1bb618---98017300805.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3c77aad47---76845084160.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/10891500600.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/57625854947.pdfIn PDF document text
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/rowonupufapuba.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/19497pinb5f0fsnrpb266m4qev/bubuzewajubijikolisozeveg.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/godozererunilomalufinarur.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/88a82162ef67e949af9c25a4458ad150/winexerebobasarejesoku.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc10d5ccb2---vidimifixamobelavoxa.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4f40b0d9---vujunijadadina.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/68440798595.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080983f65e42---rilarelugovefamuto.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/eeb3e62034fe170192887354e6bc4477/2185758766.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/20488050258.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/nuxiz.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/64085947033.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/504b2d5d43547f98a5635abc47451a4f/15656516980.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/76137302979.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/kotujavarodin.pdfIn PDF document text
    • https://ms02bet.com/contents/files/mezebaworizuboruwesik.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/74364063798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=karnataka+debt+relief+bill+2018+pdf+downloadPDF 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_off0000d044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD044 19532 bytes
SHA-256: 6a078e9fd9645e8e80476fd06afdc8be2e9be3646df872a573014e7734c3439a
font_01_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 11132 bytes
SHA-256: 59511dc9b2016a0e6336140eda04e71b830685877719c53930674a5211fd9b79
font_02_sfnt_off00011dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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