Malicious PDF — malware analysis report

Static analysis result for SHA-256 f362bf32bd0bbea1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-15 21:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2b3ea9ee83194b661525df5137747cff SHA-1: 5932a4f311050e39fe64c86ac19a83d6efde5b92 SHA-256: f362bf32bd0bbea159a3144fae1b33e9cfb7c63c82f8aa2bf35e5f278afc02d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of JavaScript and a large number of embedded URLs, many pointing to compromised or disposable hosting, strongly suggests a phishing or malware distribution scheme. The document body was unreadable, but the heuristics indicate a link farm designed to lure users to external sites.

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
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://krisoc.ru/uplcv?utm_term=napisy+do+film%C3%B3w+android PDF link annotation
    • http://mkpstroitel.ru/upload/files/pazukafaja.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/35e041d6300311c1cc8f30c77aaacd51/gesilipiripugapitugixipap.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/nipej.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/71839237847.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/zufadoribigutisejigikos.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/15486378709.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/pegoxupatikukizibudefom.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/radezaku.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/devon.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/74680907396.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/99768809432.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c63181609ec8efae8e1aa5ce41a02249/3759067771.pdfIn PDF document text
    • https://ccskin.com/geektic/files/mepimolujasafitez.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/xigurisukofarolimo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb24ef1d19---gixodi.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b9ceaad63b8c028fa72ed60ad02b82f1/12260826923.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/64988049689.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/65181975786.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/57012474822.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/tojexupuzar.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/73724488845.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/bezega.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/wefajonijugawaxi.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161361ac1a61db---36391990719.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/69470479259.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_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 18228 bytes
SHA-256: 3abab2239ca527bc2f33ae9119d3d71ea0f094a3a2739fd7f069ac0062be6992
font_02_sfnt_off0001211e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211E 10744 bytes
SHA-256: 5001fa225e4813d6331c3377d9871bd3f0dff5a8502ddd060a9185d86454c1b5

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