Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8c505d84497eb6…

MALICIOUS

PDF

79.5 KB Created: 2021-08-28 18:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d83ada000d1eeae1242eb16e7e59cc7 SHA-1: 459abf65e8cc610414249fb2b3643bb8bf201e2b SHA-256: 6b8c505d84497eb6f60b80f4cd06fa8cb612a4ccb7c9ae0e9d9311e2676a9c61
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://oniceh.ru/uplcv?utm_term=adam+and+eve+and+satan PDF link annotation
    • http://hanifeugur.com/image/files/28452748170.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/meguniv.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089f70e94ea0---pemalefidikog.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/60187223970.pdfIn PDF document text
    • https://besi.co/ckfinder/userfiles/files/fasupagekusonu.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/67969674426.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/40875896415.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f77115007---78897797990.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d54a1ed1---xogim.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/djm8cb92s8dbogju5j5rnc6d08/56319599144.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/4ca311c95603fac1c2b2339e056878aa/86976895030.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/c1li2a7gho72vqogf6khvn5k5u/77558046581.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bca93bf6c---pofowexexiwuzujeb.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kakun.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/24ac4fc25016c859bcd1712bee758852/wevubidiwatimiba.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16089227404023---80701555699.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb008de3c8---vefidiratojezemomonuzeg.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160858b0b345b0---ragimavajer.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/jadobudelonamonej.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085ce6c2adb9---texosejabixeguke.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/makarutoxozavozuzixigegok.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/lawirug.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_off0000d3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE0 10096 bytes
SHA-256: 522d6edc9f7eb967c36434194b0e9330c60c912f51be43e24c538d8d4d14fad6
font_02_sfnt_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 17644 bytes
SHA-256: a20a4a0ec4323ceef4f853b6d14d97dd85b808896c4a985010b1682288283011

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