Malicious PDF — malware analysis report

Static analysis result for SHA-256 e244805a259a4d71…

MALICIOUS

PDF

79.4 KB Created: 2021-10-05 22:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: a657b4ca0dacd732e5d68a743c9d2b02 SHA-1: 08b0c21f99740931a8005ad4faea4030a81259ab SHA-256: e244805a259a4d71bc8f3ed14bca5ca28ae429c65cbb10f34a8d31d2f6f87fa8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=investment+banking+focus+notes PDF link annotation
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615920660de21---6207237832.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/37422866405.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/94079655758.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ff76092cd5550a16e0acfbd478a22f65/gawegeninubevubewinevuvez.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/82908513659.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/59447b12909d5716a1062d3262daf619/43777139876.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b0ed3c7f3524776c6e3cc4008c1727ea/reviwilamulu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ad2128fe---27481377477.pdfIn PDF document text
    • http://heizler.hu/files/file/87605250858.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/58736365535.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/ditimula.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/setoselilenezixupomixomu.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/fanusigogozugi.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/71388914272.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/ziwekukekofaj.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/994qp3sl0ghqm2nicrp46mljg3/16288570062.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/70228499749.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/62796711403.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/48612188889.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/gupelazidokagur.pdfIn PDF document text
    • https://iwistw.com/upload/files/lomowolutiterajag.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/46927888286.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_off0000d36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 16856 bytes
SHA-256: 803255a2f462ed9baa8ac7c6b96825c8a95e37db0ec25782e4a54db6082c0079
font_02_sfnt_off000116f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 10884 bytes
SHA-256: f15796c33542087e1bb9fd3c7d3cc787bbcc5714017832ec6474d4997a04a473