Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8651323acc33b75…

MALICIOUS

PDF

86.3 KB Created: 2021-08-10 03:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 343e933fd8e80085732384ff878de5da SHA-1: d7d676f058bbd8ead5e0f291372e6163a1dd43d6 SHA-256: d8651323acc33b7566bb6e0f240e75fe0b1b878506e4eca338a2dda7e1068889
116 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for SEO manipulation or to distribute further payloads. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the presence of multiple compromised upload links and a raw IP literal URL points to a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=does+jelqing+work+before+and+after+pictures PDF link annotation
    • https://yenhuy.vn/upload/files/perokituxonirirunizopikot.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160e40f9fb8212---43872674563.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1f1oao6v7a6of3rd08mv3qrui/fisumunogadufogumom.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/3390a385d6bf31c9bc92541b7f1d7738/wologuxurevuzoz.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/tlf6sfauja01lf47ue6p5foscq6ohber/jadixebi.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac67469ba79---gesafufoxujegak.pdfIn PDF document text
    • https://okazionche.com/files/nanumesituwujelafun.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/1acf94888e8b5d33aa425a9e8d6d7224/lamurabazeniwogirofe.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/55248507391.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/janerap.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/85723041942.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd18a666f2---sukase.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/masobewexogawowenokivov.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088481746a9b---zerebukaj.pdfPDF link annotation
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1529343f58---pifub.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f359c24e96---fujuti.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610516580d2cd---66921078857.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f44654908f8---69215599627.pdfIn PDF document text
    • http://nccutrackandfieldalumniandfriends.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/56371173537.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e775becbbf9c7db1c7911790e3372554/bimuf.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/90325754249.pdfIn PDF document text
    • https://bursac.net/userfiles/file/rizemikovekevufivakod.pdfIn PDF document text
    • http://beiks.info/public/file/dubadipujixexexibivimu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e925ce233---94090142213.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/lajofi.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/gejojakagoko.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_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 16340 bytes
SHA-256: dd5786b443be2ab719f3b425dc5db536e69da06780dafecd12baa9334948962a
font_02_sfnt_off00013052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13052 11488 bytes
SHA-256: ff749d9dbae4d363694e817cd667dbc5a7c08ebc158a8b69f1c5cb82431c7c80

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