Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73474f90288b637…

MALICIOUS

PDF

105.0 KB Created: 2021-09-04 11:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f009f5c812ddfc619350d9ad659eedf4 SHA-1: d6a15c0f0aef3c09840cda777d678ad00dc2eb77 SHA-256: d73474f90288b6374e354937d0178be135721ffde7eee25aafacccf38c12dd26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The presence of multiple external URIs and link farms suggests an attempt to distribute malicious content or redirect users to malicious pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://bigxra.com/uploadfile/file/2021051803341673499.pdf In PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070beb5f1421---69809818881.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/pekajipinogefonud.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/worilatej.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612a3ae26c135---20550894033.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/29711763838bc147005f205ea4ef170e/66971991340.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/wefanotigopatemimosob.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/2966779213.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/uldvofrb8n6ihbc8mds84tliuq/91875319128.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2431f40a177cbd923a7702d18a7f2c61/91576906888.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/2a8019d2cdc5299339cab13371d37b87/80957287587.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/491f8a7db3f09f03fef44618062a7421/foxuwijidamedewasesij.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/96868281797.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/365aacae14f26e54e3c77157c12696e8/8127645405.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/adf9529ae7d1c3bc7832e0c5ddcd7f6d/70033444851.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/sapabajufifevuladefiw.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/57858690131.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/jifexijusanadufabowali.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/mokapikibid.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/1803361622.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc9306f59---nixawakukoxuvoz.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/23709759550.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/rowubenenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=leather+production+process+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_off000135b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B3 18008 bytes
SHA-256: e2e24dd9d26c97b2b4e89b6d869001aa5a29d15b033f11aeac00532566bca1d4
font_01_sfnt_off000164f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F4 10728 bytes
SHA-256: 9cd84979a99d96d9dd9ab31762422d02a002de476ea85fb0797cfdb8cc004bcc
font_02_sfnt_off00017d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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