Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4803d4f5103e159…

MALICIOUS

PDF

90.4 KB Created: 2021-06-28 23:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8f23e9550e05312192c0929b2d9fb17 SHA-1: db1735acd0ce5108a881fcfa8c94797637c2bd65 SHA-256: f4803d4f5103e159bedaaf2f3c6e4b4ae5f2d111efffac902c3d2259064e0da8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/baec0e8738da98f95e24143267ae220c/dekifupilebujojadusujepo.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943657c1121---samijotiwuvubago.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a811b369b5e23c48e0c4300ff2be10bc/zamarinelowexavesejuvun.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/f91552843e08a81a6143e309e06c0af4/13771992689.pdf
    • http://aucoindeshalles.fr/menu/file/puxubesato.pdf
    • http://zae.me/datafiles/file/vejodidasexetuziw.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160718d2472e67---7098292241.pdf
    • http://yilip.net/userData/board/file/mijumakir.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c86c4ad957b---64450365245.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/r3ii07vkfncpljaqhatutimd1l/9643744831.pdf
    • http://akcjonariusz.com/UserFiles/file/45748534126.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/kuc05a1o0ml7ojk137u4afut1m/dolaxuniribo.pdf
    • http://komputerzagrosze.pl/userfiles/file/takixinugudebomorep.pdf
    • http://sxhk365.com/uploads/file///45214446271.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d7201e5fd---tijumilipokemaxubiv.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5f5440586---90035498366.pdf
    • http://kingcraftviet.com/uploads/ckfinder/files/bufebibadageg.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c20d485644e---69642638811.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9f2cb2da0---lulezekamararonemalag.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cc3ebe95d---52543570378.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/8lpdqtb21k83al6q15fu3rha0c/sesefobo.pdf
    • http://ferramentabelleggia.it/public/file/33940028562.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd71f2e3d3---97232294613.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ocean+plants+and+animals
    • 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_off0000feaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 16792 bytes
font_01_sfnt_off000116bc.bin
1729878757f8f10b4f23e11bc581985b44e86e4b074649bc5178e83be505c384		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116BC 17680 bytes
font_02_sfnt_off000144e1.bin
52fed76bc83756ec6183e33c958bee8ad6c96637fb642c2830ae029d6f5554a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144E1 10480 bytes

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