Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c298702562fb7ba…

MALICIOUS

PDF

87.4 KB Created: 2021-09-05 13:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8523e31affe44e81c8bcefe4a0adabc6 SHA-1: 2152e29b3fd5c032fafdfa9d6b1f65aa5b59c038 SHA-256: 8c298702562fb7baa4b1b29b48ae94a9f15446562a2ddcab90ec59165c245827
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=think+social+psychology+pdf+download PDF link annotation
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161290e16b494f---49942457735.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/23125575318.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/k23kbvkbafrdlngu92n35sogr7/23183926754.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/danowedukakaxezugemid.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/axopivapudigakigudo.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/lakitovuv.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/mefokupijebojumuvixa.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9dcb9e60---zupojelosilifepesig.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/214114833.pdfIn PDF document text
    • http://kbchina.de/upload/67197815942.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/97260299832.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624426597.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895ad36e18a---genejoton.pdfIn PDF document text
    • https://nistd.in/userfiles/file/jamazijum.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/nonoxatigexetef.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/xagowijolile.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/95252187303.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/zijufu.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4e501cb6579384de6f84e39adee75cea/soxafodolakivovekuna.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/guvimi.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/8981041799.pdfIn PDF document text
    • https://bem-sa.com/img/file/74659733574.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/d8ms2upq8deft26vspesoqlrn1/54738770234.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/7a6695945930fe437a31b2b1567d3282/turogifosejobaxepoxuno.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_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 17448 bytes
SHA-256: 5015775bc8d2c065d79e009f39139b9e02bf7f336a46a61db5b503d62a5c8938
font_01_sfnt_off00011edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F2 10824 bytes
SHA-256: bba7d7f4b86512871e354948e1e384d07335c332c586843d43e6e4d0077778f5

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