Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d34178ae2faba1…

MALICIOUS

PDF

81.3 KB Created: 2021-07-01 18:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: de69e255870d7e9917c74f71d23ae80f SHA-1: 6d99f28bf86680e67ffa6f8f827c893fb0cbe373 SHA-256: c4d34178ae2faba1b20340e7394ab0bcff49af4df980777f57fa59a5fb72a1cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of multiple compromised CMS upload links suggests an attempt to leverage these for hosting malicious files or redirecting traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://canhtoanland.com/upload/files/14131099964.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27114a34a3---38783452208.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/a7085964d9caaeb83a21b67fafd15073/26718364401.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/67668368160.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/tizuduxekewizigofone.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/el752347o7kmho4p9mbs1df5t6/76117461749.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdc0e80844---datin.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/cf83d5f83513574c9842de0c3391c496/32420155068.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d532a4f11d2---17182610716.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/daguwuwoj.pdfIn PDF document text
    • http://ogbchurch.com/clients/880797/File/45875569058.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0de2d40d2---dozomad.pdfIn PDF document text
    • https://davaocarrental.com/images/file/nudulope.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/4q4kdvglis2ktoas7mn6vj2akp/8186756239.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078cd9914852---94182716953.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d230223b3a---34159593990.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/52654344051.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/sopiwezakesi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fe2cc4565---75228651303.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf91afe916f---1554593794.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/nerukusokufisiduwoxe.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3475239555---gimadosixulewuvusomateg.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/4458859687eaa1dc2bc06bb9a2542714/guvewusuxekuxawiseguruvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=prentice+hall+earth+science+review+book+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 10712 bytes
SHA-256: 6d136f84ad6201eacce05b85299527f05d4ee8ddee570df324c62424c897187a
font_02_sfnt_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 15468 bytes
SHA-256: 79eef8691bfcc653505e42587514dc0ae8111cc69aef9d2262a61bbcaf6a008c
font_03_sfnt_off00011f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F07 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4

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