Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c17448bea83eee…

MALICIOUS

PDF

76.5 KB Created: 2021-09-22 17:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40c1d6441e1eca6ed4150818e1b1923c SHA-1: 018bd990820f31067d2f22aee1b6b51e14e5f099 SHA-256: a8c17448bea83eee9138e3c03719c9c1af8d26ebefcaf71bd3f3b523e90abdb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chaletsuenodesol.de/files/mowerutujalojiperexefojin.pdf In PDF document text
    • https://xn--nmqu14inmf.com/upload/files/xatudolavotakedogujixesi.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091710480352.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/79192336994.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/27158473990.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/9880429809.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/43385478536.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301a408840d---lageves.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad6152bc4f---nizaropasapafinomoxezebi.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/16546918200.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/wemomidulufefolidipuluvuk.pdfIn PDF document text
    • https://educhina.mn/editor/files/mopobifalivag.pdfIn PDF document text
    • https://12shio1.com/contents/files/vovokadowoxafajaga.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/vujamosezix.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130232ba7277.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/94112917872.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/gopiluvusarowito.pdfIn PDF document text
    • http://remobudostol.pl/pliki/42238204445.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/31928848868.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/sovijimerupu.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/vokari.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/kananoruzeku.pdfIn PDF document text
    • https://ijpdua.com/contents/files/rikaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+transfer+file+from+android+to+iphonePDF 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_off0000c3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 18416 bytes
SHA-256: 24550079c9f5ba1d2756c7547b74d478b1d734f400d4051b467734740f4d90ac
font_02_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 10840 bytes
SHA-256: 4c33f73d881b92cf29bfb554de49583ba97745ac70cc2f68b2e2140a5cf26ce3

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