Malicious PDF — malware analysis report

Static analysis result for SHA-256 a426e25bdb1238e0…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 15:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9d58cd0f55eeaf13f362078a6d470e2e SHA-1: 3a79bc020a7f55bb611e86154280982f55f55e6e SHA-256: a426e25bdb1238e00d31d65eca8cb992b57d41dd93224414b111d694528f31ee
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Numerous external URLs are embedded, pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the non-clustered link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://catamma.ru/uplcv?utm_term=chinese+number+characters+worksheet PDF link annotation
    • https://dpengineerindia.com/admin/userfiles/file/fewumapoju.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/mijevevadafewas.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/92403000210.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/48516953480.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b15ed18d---75580585463.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d5d0237eb---50267320234.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/33809824695.pdfIn PDF document text
    • http://abpaluso.com/upload/file/ridepar.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/77170872312.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/75353695747.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/90c011d3ff4e6d74ce76fae3ce5c7cb6/rozulisimepigageji.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/42767328867.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/53924616103.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/sakuk.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/58136064886.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/9573472840.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/5q5urjabkvsu5qjkpqiht9l7g7/13884379795.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/mirorululiboremelemabiwed.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701ee9b12dc---54393231193.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/26124fd6eeab4f1609b24b9b733c8e55/7717807201.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/h7jn4gojr5r90vu8cejvsrg5p8/foruso.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7687881d31cebd605e576cca05adceb8/85896146821.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/38126010086.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/zaxubizifuwufoxa.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_off0000bcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 10900 bytes
SHA-256: 007724edab2678f111659bd12efa55571896e8ebe7c72d5b67bbad8f63c8da66
font_02_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 18296 bytes
SHA-256: 32d8f4118410934e999016eab017fd177ddc591df58c64f7efaa771cae35a7f9

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