Malicious PDF — malware analysis report

Static analysis result for SHA-256 b057222712888861…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 19:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bcfeddd4a03dd5e66b842fb04e2ec68c SHA-1: 3bb1271d01fe5358362756466fe98ca49e796ef2 SHA-256: b05722271288886189ca6ca8420bf4adf8fee665537978a42f0703e790a421bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://tahi.hu/ckfinder/userfiles/files/folukevokexixesujoxe.pdf In PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/jowagebaduxigujo.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a456fab247b7c79b969fd522872c7534/75729022406.pdfIn PDF document text
    • https://izr.fr/files/tefofatiwubawe.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973fb6088a7---tusadifu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b592c48ab26---jamopexulexofovu.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/fubogigepepupazur.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/nitajinosasom.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://giriconsultancy.com/content_files/files/39244475787.pdfIn PDF document text
    • http://pinxedien.net/upload/files/xegogokomajiruk.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7899cfd6b---79854172606.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7836ab8ef---83937735986.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/0mcbm8lnmjq3sqnali7dfglq16/novebexujubujesuni.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb79a72176d---53159042379.pdfIn PDF document text
    • https://actorconseil.com/files/file/79478647296.pdfIn PDF document text
    • http://mosjob.ru/images/file/votoziwebufezifekira.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/nasizamizotila.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ee619f9176e---tukofadotasaxana.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160870d58dfaf8---zuxobijuzimapewup.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1351a442e1---93808189728.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5777d4bd2f---4978863707.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f82a908f2---16955983884.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/tixaledimezilokubizizik.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/56502005689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=linguistic+untranslatability+pdfPDF 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_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 10856 bytes
SHA-256: 3389dd44facf2a106509319e701ea2fd19ee509d66af9583295451bf38a6c6aa
font_02_sfnt_off0001170c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170C 18384 bytes
SHA-256: 0d89e9856bfbcd832e245cc94d7fb2c6776ba8353ed3f378e5f63c3fd892beda

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