Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f3d3faf3ec544c…

MALICIOUS

PDF

87.7 KB Created: 2021-06-27 14:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0101e7c91bd31f10c594b13444e674f SHA-1: 33539f765ab39852d0e3e58fc272ed647de89619 SHA-256: 11f3d3faf3ec544c73bcc74a9a1ba531907164f3ee1b8c6d2c3cce32c1cf7666
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to host malicious content and redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=the+guardians+of+childhood+book+series+free+download
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b063e770---rawenatesafuxagasudujo.pdf
    • http://digemnd.com/UserFiles/file/xonak.pdf
    • https://rosycaffe.com/file/polazugu.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/cbrdb8t8jo9vogvtqt7894tjkq/majunasijivo.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/ua9dmdqq1nvfcra1nt542ef7l1/negebomenemawiwede.pdf
    • http://theclubburger.com/uploads/files/70027897721.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17bb1fd25---15022356211.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabb104d1e---ditokelotadowasibum.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a75eac8dcd7---30329784887.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/g2mj71sp9unq76ieo2dmf08oak/ladelazajimetunojusomalul.pdf
    • http://iberia-ex.com/images/blog//file/14822323888.pdf
    • http://vodnik48.ru/content/file/widisunepunuroda.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/pep1sf0onr2ahsd7jvrevgdk10/33125087537.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6cd9e08d---jopuz.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b406b3162d2---tasafan.pdf
    • http://oilmachineydy.com/d/files/taniliwukuvutawenagipakew.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a34d30b4151---35869312937.pdf
    • http://iqlacpro.vn/emotive/upload/files/49501578904.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160929e20bad7d---95634836790.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e9248d5780e8fa1e620cf1ecfcf67432/topogamumolol.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078fdfeb3a2a---zupur.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608352c02e182---kuxinebugusepumomu.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c998822c8---lixuguvefumiko.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/xewuna.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/sqq3deiofc84cp09veus562nat/52791374717.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f163.bin
5a2f725a84608dea40444a1249b60d8a4badfe9aabdd86633028bcf967d1bf24
pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 11040 bytes
font_01_sfnt_off00010ada.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 16792 bytes
font_02_sfnt_off000122ec.bin
228ee39f68b9bfa3b7e3bb0c406ecd511c285bb42860391b44b689b100283f7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x122EC 17764 bytes