Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd9bffebb2f6bc7…

MALICIOUS

PDF

76.5 KB Created: 2021-09-06 17:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6a53f809df662750f1e84316a278ab8 SHA-1: 6f6bd861427e9d6c353e8a2d6a3f51c58f17b568 SHA-256: 0cd9bffebb2f6bc7f7af4efb6afba86831cb2af29466f2ec998bd169ac8073e9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://temple.mo/userfiles/file/76945300579.pdf In PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5a7fda8d1---9361973200.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/gomemugomixabogeve.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/sukulu.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/nawidosazojeparozad.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/3d43b83523c23eeedfd7925e7cc6c2f3/32918017856.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160779aaabeffc---91486970562.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/36569096951.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8071030f8---ripotelebig.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media//54457616802.pdfIn PDF document text
    • http://zerosquareonline.com/file/vivudopidu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4dd95ee39---lawujasaxel.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/93095136516.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/zafumasa.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/zavaduguz.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/52a3e48e7f2d603b5398965398a5044c/37878555464.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/b39f3910cc6517d69010a88ebd7f7c35/kijisexew.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/cfda004c32d439aaf1cead57b97bbbea/92762469307.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/ledovimifazaw.pdfIn PDF document text
    • http://charivne.info/images/file/fexotovufox.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/83406306711.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/kagajelonaf.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/bb0e070907f6879cfe80c75a83b36f86/vufufaliwewusuvinetedomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=present+tense+exercises+worksheets+pdfPDF link annotation
    • 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_off0000c635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC635 10792 bytes
SHA-256: 103cbc403193d7237c80847a5d10b53530a8e08c4bed5f5da20f4492420ca9c0
font_01_sfnt_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 17732 bytes
SHA-256: 9e7bb907c10ec6fdd5468309b6670e58d12313f6cd7c0050583b589e1cbdf86f

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