Malicious PDF — malware analysis report

Static analysis result for SHA-256 818ed7110d1cbd58…

MALICIOUS

PDF

97.4 KB Created: 2021-07-07 02:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2cf8d5816e896261ddf91a8d136c270a SHA-1: 22659e4288aee231c0195e8c6cb3a5d2987fadda SHA-256: 818ed7110d1cbd587ad462a53d265369daa567b43de878f5339417ddf1d59d61
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093a26471d55---10735817922.pdf In PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a00954df5997ac56b073cb3e2ec0753a/lulob.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/2cljoius1u8ru3ump17big6en7/27162110157.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/70601030944.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/49177943474.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ea521b236c07d24d4ed63d45be3a1077/57956321563.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c0dfeec8f---zadidinemis.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/164e623b8762bbba0d36dd1aad2319f1/87148961080.pdfIn PDF document text
    • http://bwc.lt/i/48188407809.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5fe103516---85616322686.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/34158009941.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5c6cb76c8---82407266666.pdfIn PDF document text
    • http://flexicourse.cz/res/file/muvutefozej.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/c36f5883f4f24b0b8794d2fdc81131f0/pupofotogejisasar.pdfIn PDF document text
    • http://zuche0551.com/upload/file/37624566992.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fe8e5da90e41f113855f15d2cbcf0162/fares.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/5d9142784aceffe4f7738176234c4110/gepokesevesosodezef.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/nigulojejigusimonuwidixog.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/juretafowajodadewode.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e65ad4f3f749dc53179c9f7d8ac9d44f/2341000967.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c2a148c2a---tiwevorewuginepusegunegar.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b362152a9c6bb80f176cf7045aa4a769/nuzagokesetusedevutifetun.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b912e257f0c---soxapizufopidegolugipasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+depression+cure+pdfPDF 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_off00011ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB9 17024 bytes
SHA-256: a2d0ba4d556760e49235442b806eb8313f72a1258062b85e6710f236a8723290
font_01_sfnt_off0001472d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F44 10472 bytes
SHA-256: 0afd925e387403e96a8fcbd494ace1c63a5250f4761d3c2dfec2acf012935e0a

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