Malicious PDF — malware analysis report

Static analysis result for SHA-256 8408cd841d02ef7d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 14:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 87f42dbdb04db998e18cf2f5e793c9b5 SHA-1: ba12acb1e1f92c5043f1d7d67c81a8fa709fb0b0 SHA-256: 8408cd841d02ef7d621bd9f9f9ef2c2e75d0a3cdd7581c0bddf322f224fa6737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/f71k5ellfqaiudpc6apep6unug/sojusabusa.pdf In PDF document text
    • https://ochronaskory.pl/pliki_user/File/jefetejaj.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a1a8303a0---zejitubadekolapo.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/91125943607.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/77000989679.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/jarexovipipojugokunozorok.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b53b9b59b---wepapinorufenoka.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/66460123512.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210910114929_788781093.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1b252c1788e3dbd4f6813c1b5a9f1e79/45376869706.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/rikeguvapo.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/linese.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3b1e74e78---52296507049.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/87688815693.pdfIn PDF document text
    • http://nenorm.com/files/files/fajep.pdfIn PDF document text
    • http://coachhouse.info/assets/file/vizopal.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/zezut.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/2555128274.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/ritenesoliz.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/72557063926.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/difazazo.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/77611374700.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/buxufonuvolidomiwopit.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/dd00ac4f5e25434fa7ec6df07465e59d/xanejowe.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090909261770554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=my+new+iphone+is+not+downloading+appsPDF 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_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 10764 bytes
SHA-256: b87f9351e6437b24f89c3f004394612b898cdac7d47569d8c6d07f77c6713eef
font_01_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 18044 bytes
SHA-256: e8a9b985e0efad046a8cfd77340b1134adba655b48cdb4ab1be0473acd8066f6

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