Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8bbb47e534ab51…

MALICIOUS

PDF

86.3 KB Created: 2021-07-12 17:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d83b1fb02f5e5cd23a6485447e8a54a0 SHA-1: 620777503d5bcc9324c7e74b4af0f06304e690a0 SHA-256: 7f8bbb47e534ab516d67136200860ee89637eac3224041066b7571afad03ab9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites for distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://irlanc.ru/uplcv?utm_term=how+do+vascular+and+nonvascular+plants+differ PDF link annotation
    • http://growlink.biz/userfiles/file/wutedopuko.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/dapujalo.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609771d13ba8d---87182820525.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/nilakeganevuzunakol.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/kogoferugajekeg.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/35e9da47e90ac0a6502efd4212351026/bekiwoxudopaxomazin.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f390c528f---44897510739.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/lagisivutumemuzabijiroje.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/283de144aaa0a0b91a7644d84acd7230/62653116536.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/lerabuvobotuminexezivojat.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b15de278---84391037531.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b95e033eaa---9190255383.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/624ee56f91ca2129bdebe162c13f0b8d/56483997878.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e2208a3c6b8---vukawuwoxazugokemizu.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/7669700497.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3105dc34d3---51141408141.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/a69ebce9dc69f6801c3d0b7643004006/31702958632.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/2a4g1s2lc49knl372jpm6n77o4/97274855011.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/91768878536.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021637541.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/67100632451.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/919f3c3188a5042959f9372531ab60a8/28357808688.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 10856 bytes
SHA-256: 798b966e439244a21e1386c7447fc574761489d2f20729b17a88ecfa51b3e2f0
font_02_sfnt_off00011fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 17020 bytes
SHA-256: 66ddf680db50bf6e33c746c9da20b835c085061b29d636a15f86c44a5419da0e

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