Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8df764cf8604acf…

MALICIOUS

PDF

82.5 KB Created: 2021-10-07 08:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 37648a7431c512ff3ce200b4216963f8 SHA-1: 67d991011677bb9bf0b3fd9ed7211db69155dc9e SHA-256: e8df764cf8604acf4d6aeefc35cd09eaf2926dcbb8c4e3851571046c60c98352
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crewmak.ru/uplcv?utm_term=dog+in+heat+throwing+up PDF link annotation
    • http://nasfthr.com/userfiles/file/vanepinos.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/guradopogesujav.pdfIn PDF document text
    • https://hoavily.com/uploads/files/27014513957.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152e51dc9435---polimejigaze.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/duwemisovor.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/dikujep.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/mujunibi.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/i857qb54mp9e38ssu95uqkhsmt/kovuzegisibafupexe.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/51158686994.pdfIn PDF document text
    • https://stvorki.ru/files/file/nozarotanuz.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/wowapidefafu.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ff5def3a128c5794570f9cd811e37ed3/jozokavise.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/6113617088.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/93817997234.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/wuvejusenafokagatubuwe.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091220170143.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/41845957257.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/20251281061.pdfIn PDF document text
    • http://bjjiffy.com/upload/kaponekijigazogo.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/2399943670.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f6bcb9633---39063806725.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/63600365550.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_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 19428 bytes
SHA-256: 278dc66248139b22cd5ab62f26ffc16c94c0be7ef1f22b1ad1635c1ac34a2a55
font_01_sfnt_off00010cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 10504 bytes
SHA-256: 5db4c34a90fc053d53a259bca5699a339d98d576dccd046cc707a2312479d6eb