Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c6720de1dba4c7…

MALICIOUS

PDF

88.3 KB Created: 2021-06-26 15:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d10b9d91d5481ce750529a19a249cf56 SHA-1: c9d87de7e1e4fc18b2590121a9cd34b0fc04f22f SHA-256: d2c6720de1dba4c71a863f6c9ca83f1fbd5a02c8ec98baaff0ae782cd1876600
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many hosted on compromised WordPress sites. This behavior is characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users.

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 https://philabc.ru/uplcv?utm_term=the+name+of+the+wind+free+pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4d23e1c4c02f185aaa98ae37f018b06c/gafipopisegejekutabiv.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/93922774606c65f19797f1bb19df6511/xigadoperulaxabovawu.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/popizexa.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa090f09ef4---lurenodijetatesasemirire.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/a8ffc6eed77dc87097edace829ae78a4/36846890653.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/1067765965.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/78c7f7de9579f7b8e297dde7dbd643e5/rijonegugajodiza.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160723dce92b7a---10416630114.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/an9v6pptnlaavbq5nc6mmtcp4j/64976629684.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7be16dd8a---61043982628.pdf
    • http://clubselectionvoyages.com/images/file/28115610518.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/dvbecq01tpnbn14uns83hn42o1/wadiwirabejowezezebe.pdf
    • http://logo4you.dk/userfiles/file/62617712002.pdf
    • https://lepjunk12.hu/uploads/files/rugoxofogenakerogof.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b489b7d8ef0---japedo.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b791cd07b2---5809774771.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/024b2ea22502fc73a3f84d2825292e9a/vudunetinulavavo.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab182a12f---58641187467.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/224e7ac75c6bcf5e843a19ddb74445b2/46883054684.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/u8u44gbo994t5bsdt1u5jkned3/44002985858.pdf
    • http://christschoolblr.in/userfiles/file/sofepifefuj.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e27e940764---5146766515.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab430b13e31---wuxuzirimaxaruvu.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_off0000f365.bin
0432ca341aed7de9ced517f58b179bc99b90ef3a62bc33ee062ef0e7e71b0218		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 17716 bytes
font_01_sfnt_off00012228.bin
d28755fec84fbd62fdd3b91540f4cc08900013a567bdcd6e35e03b186a8beb19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12228 10600 bytes
font_02_sfnt_off00013a32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A32 16792 bytes

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