Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbc5e435615c437…

MALICIOUS

PDF

95.1 KB Created: 2021-08-24 19:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae4e342a8a1e8b9bada8858492849089 SHA-1: 487ef1f6f6a063e9a4ea9e4dedde46e55b26df97 SHA-256: afbc5e435615c43724f8aa10a276137c919c288ccc408603f4008f584e3c1d34
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or credential harvesting lure. The embedded URLs are likely used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://daegyung.kr/userfiles/file/20210728004203.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089323b24d87---fifowefefuluzewike.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161044c905fd1c---56440270854.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/jjv7bh91c71sa5uii80e4d1u4v/jopakupud.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/q5rjm12kgumbmf0lq4p0sebof6/luwalaz.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db94dcc45c---17451416099.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895e04b6f03---gemexijutidokapisu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f5bacd9d4---63839536905.pdfIn PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/pokaj.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/31676857753.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5b1886258a1fe2863a0d51c7e528f171/kudot.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/dekeleseg.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0c990f978---zokoso.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/37558439617.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/paxelogo.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16265422701823345726.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160970f49ee5df---15233231745.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/82960155806.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/27931200446.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/24j1mr14ukiip2dcalem64jls1/jupem.pdfIn PDF document text
    • https://begili.com/uploads/image/files/52147761042.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/galagujupubufezekunesamut.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/44000379894.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be6a923a376---lukul.pdfIn PDF document text
    • http://sooclose.eu/upload/File/nugowuxibozes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=4+elements+monk+revisedPDF 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_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBD 10384 bytes
SHA-256: 44b2375acbcc4245c73badc42e2eb90e1cb45e7301df172863ae278092aaa303
font_02_sfnt_off00014332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14332 16716 bytes
SHA-256: 9bc6578d753d7993c13e71b44aa2ad71284389e2894fe7091fbadf00a751ffa2