Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a07b321cfcf6e6…

MALICIOUS

PDF

67.8 KB Created: 2021-09-28 20:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c90d560a0f5bd8845df67aa0e53426c5 SHA-1: a32ab4a695165bf3baa96cc6878e646e8318b4e3 SHA-256: 44a07b321cfcf6e679d8aafc182c289961c03b27ac087a14cbaa6fe609c6fc9c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://cructi.ru/uplcv?utm_term=delete+chrome+history+iphone PDF link annotation
    • http://studioingegneriavaragnolo.com/userfiles/files/kufedelagisa.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/6879704070.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109180159262390.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0db4731e0---kuvuru.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202192200242281.pdfIn PDF document text
    • http://zkpower.net/upload/files/wunowuzikorikovetejudusaz.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/66994017992.pdfIn PDF document text
    • http://suaups.net/userfiles/file/43502475272.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/wegojibizafapitej.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/9126262061.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6cfa77612f70f95ad03a31d2989d6ba7/katedexajusisoxinili.pdfIn PDF document text
    • https://pratham.one/file/19480480269.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346ab51fb2d---26867467619.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/pobnek1k3it9duij8g83o8nnd9/51534171097.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5b48b31b7---tarotur.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348b7a8a9d4---jabib.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/91717808124.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/nutuxoju.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/78902753946.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/22631272242.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/12070331151.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/pakezelabenepoded.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_off0000adc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC6 10592 bytes
SHA-256: d2ffdd06a52688ae39c9b5c83be38a957222b49af0b60f346ff001e65366a8c6
font_01_sfnt_off0000c5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CE 14364 bytes
SHA-256: 3f60d67d20e412823c97a7f09b1d08ff717a2be244ffeff6870bc75c2b092271
font_02_sfnt_off0000e9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1