Malicious PDF — malware analysis report

Static analysis result for SHA-256 70816de273fc0f6b…

MALICIOUS

PDF

89.5 KB Created: 2021-07-31 00:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8292874da82e542905335a44f79c4b6b SHA-1: 2052cf59e9e4cdebf4f6fb69eb4a39e688f75bfc SHA-256: 70816de273fc0f6bd61c2cfaa6ff727e0aa2442b873be75503ff2057170323ad
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic further supports a lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=saddleback+basic+english+grammar+2+pdf PDF link annotation
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee69938949---doxowokejilipop.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/10025400439.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bd3e61368ec84e73edbcef190524ccb0/desopuwixegunejaxaroxub.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/xubegaxuvujeg.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/fibaxaxapubomoderofevo.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/1322362031.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/21597882928.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708c99d364e---18398315747.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160beaaac766b5---dawekazewuf.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eca1fcd9c7---fupip.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/23943121320.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/xixobejobopa.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72922e4599---fomilisadozofe.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/purepexaxigikuvonijidi.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/56427711213.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe89ec183---46229598272.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/71dd16eb52694c7cb7eb2abf107cb685/26025407609.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/givogeluvirabasore.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/towekaxulusog.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608655f31077e---xalisubukemin.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/16353216213.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/gekofozomenotox.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/zujavu.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/tagakobusakavabag.pdfIn PDF document text
    • 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_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 17628 bytes
SHA-256: 9249876778542b41257f0e8862be8ee679785cf2b37beab1440a4f6c30823156
font_01_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E03 11276 bytes
SHA-256: c5f72faaf8037f7a4c1f29dad5f1326bcbc71312d8e1eaac48027a4075a12afa

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