Malicious PDF — malware analysis report

Static analysis result for SHA-256 645e1f823d1a1f25…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 23:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e69d2348e51035fa573c39a87b0440e SHA-1: 609c7954721dffe25965fe09afe71fb3a9ca047a SHA-256: 645e1f823d1a1f25ae0f604148ddfd9ba4780c7cee9b09e646c42458ffb67ffa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, indicated by the heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggesting it's designed to trick users into downloading password-protected archives. The numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, reinforce this, likely serving as a link farm to distribute malicious content or phish for credentials. Although no scripts were directly extracted, the PDF structure and URL patterns are commonly associated with malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/uplcv?utm_term=ppsspp+pokemon+black+and+white+download PDF link annotation
    • http://kwiatmetal.pl/userfiles/file/97985468530.pdfIn PDF document text
    • https://socardan.com/userfiles/files/55645738395.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/wenamexolasekemamafiw.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/18646405020.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d89831141---95152284617.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132109fd8a29---kupinapexuwutitidox.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/133476254.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/96035654141.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/25235163256.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/felediwobedobuwadoju.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/q3snft1bmrc3r2ti5j8eck8lh7/47097939202.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/39macnl743kldql1e5b35e17kv/45367151692.pdfIn PDF document text
    • https://masukpt1.com/contents/files/24712964307.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/10512126748.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/bewafasexakobulilojir.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/megexanapizunisos.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/5790124254.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/pusidirize.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/77540026909.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/jifutifotiwukuzogul.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/boxekunagorabe.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/xaxowubuxopi.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/xulakogomawafojexezikinam.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130f23ca2e85---wiketobis.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/topuvirogo.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_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 18268 bytes
SHA-256: 15dc0c54fa2d4dc0dcb18c0b370e0e4d53038137645827871ac43e829b7dd55a
font_01_sfnt_off00010b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B51 10996 bytes
SHA-256: f9a8d8847f33107afc6a038ff7e8cc85d5edc1befdfff80ef2b889eb10de877d
font_02_sfnt_off00012488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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