Malicious PDF — malware analysis report

Static analysis result for SHA-256 f496e7e0118a85a9…

MALICIOUS

PDF

78.5 KB Created: 2021-07-18 05:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d04c5a3fa49d65b45d0c61e1b8b0c2d2 SHA-1: 639db9c06910815700dd12431c23964904a19e9a SHA-256: f496e7e0118a85a9ca426136458fc91d7c5b228877e18f2a9cb7d6e96712f5eb
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URIs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the structure suggests a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://anmoul.com/userfiles/file/1758819877.pdf In PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091015d9d3b3---tuzufusinotixamaruta.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ac9477b2b---fetuk.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/50792714285.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/qlmoots5kd462278dn5p6d4j36/magemelar.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/28883298660.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/39779922655.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7afefn458aqlu2gqs47m8p2cak/biselufutogaxojukamotex.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/d7ggo6uhp9780ejkb8c831rddm/96433043636.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/vibeminusuvibunifir.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/zatikajenosutewituzeju.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b8ddca66471a6f0f679f2bd8c4a3d0e8/59415812665.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3df694381---bekedof.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/55728571461.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/a5lt1p0327711i9rokon71q7bg/34579963096.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e7b1b517f5e80cb12829a87eb96b2d73/motufibumuzigenapigelape.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac041b86b97---40788364723.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812447045a7---82893332531.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021062616211988348.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/mus9v0nl6b6rnhjvs8a4ndpja6/tidesenobexigagunoriba.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/porelaguxe.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b05c3f22645---33111830557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=stand+by+me+acoustic+chordsPDF 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_off0000cd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 11020 bytes
SHA-256: b592cad4c5bd6e66c4d14cf53361d89e708ec141b21c89fad0c4b28a93bd2e60
font_02_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 16808 bytes
SHA-256: 334df73658b36d46bcfc692c1d8f0fe6c7ee648125bbb053e74aca20cad9200f

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