Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd53a67ad5de3053…

MALICIOUS

PDF

110.3 KB Created: 2021-08-21 23:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a8bd8dc6fc77af166b07d2b2c704710 SHA-1: 44fddfd057d5dcafe861d7158ff502840857bc81 SHA-256: dd53a67ad5de3053ea43976ec1c25d472c0f92d12d4f23e9a186dfc434139060
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. The primary purpose appears to be redirecting users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://barcelonacentremedic.cat/files/galeria/files/polamurisagowifonu.pdf In PDF document text
    • http://unipsyclinic.com/userfiles/file/20210629045822.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca81fc3dc4---94248519211.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/vjla8pcdpgjsipes3mis97af2d/10665397133.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/o6e0t2cabqdr7uoiec6ki81i30/devosalevajekejotogela.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d30777538f9de819a1083b08d747c9ff/1602451225.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/zejozabenuza.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/29052278304.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5237c416b---15908475827.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/42383471778.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611e073335ebd---16084208290.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/mogutida.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896e363f67e---loresukizagor.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/zudexebiragagudigalisu.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/gabilira.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f7c937ade9e---67553159964.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750ca665f05---85325497665.pdfIn PDF document text
    • https://digiconelectronics.com/media/9599460732.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/2311820399b74011d4b53597d522b39f/bezizogebekasodebez.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/fugudevew.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/59225856194.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/wifemamofutodobikiwesoluk.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/sajodipaka.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9fb7b245b---jelefaxujoxepim.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5280c851b---88014279262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=international+business+competing+in+the+global+marketplace+7th+edition+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_off00014672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14672 11400 bytes
SHA-256: 644acc0fc34cdbb5a3bafd22eaf9a3b817aa3a304f01d267f3c2f2ae330766cc
font_01_sfnt_off000160c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000178d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178D7 18180 bytes
SHA-256: 6d56351cb898b89e860199853d5ae2ef401861a35a608d3dd240e6225bb05a9d