Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e451912f82a64df…

MALICIOUS

PDF

93.8 KB Created: 2021-08-17 13:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eef101fd0aacbde899fc9c0284005dfd SHA-1: 9e4590b63a428e81e5c2f75dc44083d7de73c9bb SHA-256: 5e451912f82a64dfe942adcfb41e45393fe9c5f9512dfe6ec2068008d048bac1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or redirection scheme. No scripts were extracted, but the primary attack pattern involves directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/wedolumaroroguro.pdf In PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9498209e3a3bac5400e5758baede4c2e/1848365304.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/robaxuzukenimotanatik.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083593809ba4---notefunopukabekufiwuziku.pdfIn PDF document text
    • https://huanghecables.com/d/files/vevufage.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607af80bc4a44---43967949856.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/lalelinigelubafufemunedil.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c84bee062---25398225065.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/atfj843rpjvfho6g3cktj42al1/ganupaxeke.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/910c8076ad2d53014a8624d1c3c9ad07/nafafuwemogofo.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/webozisizetogi.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/37202021208.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/turivagir.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/gavubajofi.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609071617aba7---15137443972.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d172f25fe---viboxavomenidobagu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf336e3fa0f---16070149325.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/71236890987.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/274aaf03ce7300b0ca9dfa4c12342153/notetudeberasejisoxige.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fef01b7ddb459dfc41a6d47649488d8d/gumemomutenop.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/7009169094.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c151209d45---mexuwexekit.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/ziritilajep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tirade+du+nez+texte+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_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 19968 bytes
SHA-256: cab441f1463cef3c305f0659115145a6c835bef19cb5f9a02754c6c0aeb041cd
font_01_sfnt_off000137cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CF 10380 bytes
SHA-256: bcded7538caed36ffd2b56a563e654d5e720d7a069e818c044eb504491c8bd1d
font_02_sfnt_off00014f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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