Malicious PDF — malware analysis report

Static analysis result for SHA-256 aade2e21b7e3afc6…

MALICIOUS

PDF

91.5 KB Created: 2021-09-22 18:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fec1da778e720c84fecbdb4ab5f381e4 SHA-1: c3a5c9bfaf185b11ff6eb99b5948233bfa7a33ff SHA-256: aade2e21b7e3afc6c53fea7adbbc02206e7081397d109e236edef183e222b9b1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=open+dns+server+for+android PDF link annotation
    • http://stavo-bazar.cz/userfiles/file/98734696270.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/nakesexabawamiripidixoza.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/wejewuteva.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/21971266225.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/2786528840.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/81309178460.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/80996157862.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/10539212774.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/23750736338.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/pizebe.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e7adecb42b362ec9405447df1cabe4a1/wazazetizemelizilugogasox.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/xusegakojokozufugutetube.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/26bf5d044063e66f73f4991b31fceee8/94760564325.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/15348950674.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210909_183748.pdfIn PDF document text
    • http://tochuchoinghi.org/files/rixirajukef.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403f80b547c---sopedaper.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/duvitijaxa.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/fiwawademabeni.pdfIn PDF document text
    • https://dm288.com/slicice/file/53290755069.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/23275167899.pdfIn PDF document text
    • http://olapromos.com/ola/uploads/editorImagesfiles/44574999231.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/noburavukiso.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/debodiluziva.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/94897715609.pdfIn PDF document text
    • 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_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 10440 bytes
SHA-256: d6fdf29af6739a5528f7f1a4a63afe7f2bb890884d2dccc0d6e59adc5737b5ba
font_01_sfnt_off0001193a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193A 18020 bytes
SHA-256: e995e00542b094d07c47b119d05685c22660c0bcb5846ce9ed3ecc2955f5dab4
font_02_sfnt_off00014849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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