Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66ac1cfd9fed7a9…

MALICIOUS

PDF

88.8 KB Created: 2021-07-18 11:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 28d35c14e8cef8c7df6d4d44c7b48e5b SHA-1: ee22a6361efca32b210f847021f2feb7f573a36c SHA-256: c66ac1cfd9fed7a9a2fb1690a2fd6d4e82350934c5a816618cf925a028770c7a
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a95127c7c7c---26283138984.pdf In PDF document text
    • https://hgb.se/filer/file/fumaredev.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/c9c9d2605045fa7cf2da1cdf78c7520e/sofejo.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fad3a25f8ca5b68e7973abc4dec2d42/liwesovoro.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/57597255558.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/cid31co01a732qnu4k18t3ri0t/77255228300.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ebr6iilcoko38l4j72h7iaib3/61029040402.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6834eab7380f5dd363f9c5fed08ac796/28133547819.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/mh8l1n0nc4qap7kur0nn6m64j7/woxezulima.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/ff04529e02a78d90cdacfd7ea6ef3e2e/rufaxomirasegukufigari.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/tepaxodirutin.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wojumejuk.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/sumajeridumuse.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b7cacc0d9---loriloxudazemeboku.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/narikelijemexowumi.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/nubodibusakume.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/1ok01tb3jd0q6cdkn32e9t1klt/wixokobamakamapidapaka.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/resudezi.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/96882375036.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/38382165819.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acb8f99c37b---55650585392.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607df30d7cd57---vafilelolegoxulixe.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ff09baab4cd5c724dcc097bc61b14f84/96220122941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+wolf+of+wall+street+full+movie+unblockedPDF 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_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 18164 bytes
SHA-256: c44c20e96e5607fa40ac88213147ef5cf5b5d70558f6f59b9e41c67c7dc3edb1
font_02_sfnt_off00013bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD7 11188 bytes
SHA-256: d8dc374e730763c3c9717d58359c2dac75f3e25f65ec0f88577df3d1ffe7efb7

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