Malicious PDF — malware analysis report

Static analysis result for SHA-256 931cf26757a305a9…

MALICIOUS

PDF

95.1 KB Created: 2021-07-05 07:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fd9109ac78fad5081845b49811534a6 SHA-1: 952241cc871ce0f470f6af642f998863bd0063a5 SHA-256: 931cf26757a305a9030bc471bba071f482350f1abef83f030cf2e4e7ebf47bb1
156 Risk Score

Malware Insights

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

The PDF file contains a link farm hosted on compromised WordPress upload storage and other disposable domains, aiming to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://silesiacapital.eu/data/file/98740781499.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/786ddi95j2ltjs3bn08q1015p5/lobosaserazutosafog.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/b84d1257a666f36e17a80eac5b6b40e7/wimupoxufovaxojimefavo.pdf
    • http://drivingschool-brno.eu/files/63465625713.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/5c4a8649481b938a1a2a267b5e25fa9e/29892522058.pdf
    • https://mzlpro.com/web/img/podborky/files/nefegimugejofitibelubiri.pdf
    • http://softtox.com/new/userfiles/file/pixuxolavizujotupusumato.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c5f45ac76f87cb79de7e336b57561c4d/26790077630.pdf
    • https://kermiradiatoriai.lt/images/files/22929584909.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8606c33db---46823769851.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608a30f903614---99857315448.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3af9b3d115---taguvopa.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a0fe1e6e0228732d21ec44c209c00cca/mepinopidigovegu.pdf
    • http://k1a.ru/images/files/file/gezajexoranunetogemu.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee4a2d3e9---sudutupusuligukududavuwot.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/1jg7orcgl7f49b5g21e365g41j/kadosu.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607976de2eaa1---dajetizigavujerom.pdf
    • http://strandedtattoo.net/file/ruwepipijabotufaxam.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878c7763553---megipefopeduji.pdf
    • http://christschoolblr.in/userfiles/file/rudededadavotimidefida.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/rpf716gfmbus115vd4ui1jirgf/40983103322.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/57291dc047d8c4ce94de819e2aa025e3/22116814411.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/5iktvg8eoboqoh71lkc18bgim0/fudilefugapazazusipaxuw.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f487e22da4---40551796695.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=jhen%C3%A9+aiko+you+are+here
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113a4.bin
bf24c5e1a91f2d63296aa9d3873dcd861aad222329f9359f93862efe4ae559e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A4 16560 bytes
font_01_sfnt_off00013e55.bin
44c948466f0f5f68841bd626b8ee81c0fdc6660e320c44e6074a1d6eb25908ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E55 10344 bytes
font_02_sfnt_off00015550.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15550 16792 bytes

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