Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04e9158e04c6f6d…

MALICIOUS

PDF

92.1 KB Created: 2021-09-02 05:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9be577046cf0279cc7df06da56fd3a0d SHA-1: 1b8bca0bea8649d2f321505a0c3c123177b0ff71 SHA-256: d04e9158e04c6f6d17cbad2b85bc11b9484de09a9e76c1736409b7036fca645c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs strongly indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://krisoc.ru/uplcv?utm_term=female+snooker+referees+2019 PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0fc378e8---luwekevifowevasa.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/20271927840.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/15536518166.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/zotoxorabulomowetegerora.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/44028587336.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/91747122201.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/51717388644.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1c9f1a2db---95832047145.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/92271274312.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/jazexovobotigas.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/66748141294.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16091f3c544807---66509153700.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/sawevud.pdfIn PDF document text
    • http://darstin.com/userfiles/files/vojekenobomitawujalejada.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/rubatisunu.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/lopotijokegivunoxetubiref.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba79ed3bf7b---wutusixotagif.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/87481886884.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/f2ac53e12e84961510f7ebc96f00dd71/pirap.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/cccb8ed9ca6e5a75ebbd520306b6c21b/16953562637.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3b2892194fa9acc19e5af58413eee218/rakosekonepivesinuxe.pdfIn PDF document text
    • https://menu2uplus.com/images/file/furejubevisusemu.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_off0001004e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 10716 bytes
SHA-256: d020cb5be8434f5b7d5096279e12380c0a2c31cfdb3a5277340322ae4c38213a
font_01_sfnt_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 19112 bytes
SHA-256: 93b4fe80989aebd8c272906bf10c554a4a2f8d0bae69664c42e9d256da689cbc
font_02_sfnt_off00014a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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