Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b427db9d5156b7…

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 18:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72a70a47a957d395b8e09b6457853aa9 SHA-1: 0a1963a995a4bb7492b668c086b169e70406a597 SHA-256: 22b427db9d5156b7834b301fb91c04e1371b46eb97975bf92d3bb4195221b7d9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The file's structure suggests it's designed to lure users to other malicious sites, likely as part of a phishing campaign or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://micast.de/wp-content/plugins/super-forms/uploads/php/files/75qaqerdoor5gkfj0ojv6p7g55/8943864104.pdf In PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c94412374---67861152137.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/88744004673.pdfIn PDF document text
    • http://yaheardfamilyreunion.com/clients/6/6b/6bcd2b4031d0b832efcfffe4b90de728/File/bidofesajizinu.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/59464034372.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb87350a4c2---nokuw.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/f3s3oatudnq6ito3c409qfm8up/56652013243.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608427684bdde---lesoxawigizogulegifizubu.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f96b3900a---18388348341.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/upunh7sqpet8u9nalruak1dg74/47427250258.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/difajanevekekiri.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/93069822052.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/72705199598.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc04684357---goraxakofirebolukuju.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071702664739---mofadolifonokenuna.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/81985494076.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161263e90950e0---fadokarutovubisefuposepu.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/40556ac20e285bb40f075474048e4434/5933507652.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/66105247748.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/15398510776.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f07375a7d5---muretubetupodiri.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/kutikidenuwug.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1684d09e31af2ce2a141a4bbff1e1a0b/zavapazubaforogitama.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/rujepigejamifipolejibaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fillable+form+word+to+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_off0000b9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B7 16556 bytes
SHA-256: d559d286179845a27e0be8842722beb7261d7bc12caef087379fbf83a59fa852
font_02_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 10592 bytes
SHA-256: f1d8faedcb97006de582b230e8040b65536817347309d688411ffe81907e5b02

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