Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b06f3a66f156ff5…

MALICIOUS

PDF

92.4 KB Created: 2021-09-02 17:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce913b8baf1ffeb77e4cfae84ebad80a SHA-1: 3e2b9bc5fc7fcbbd8bc5569f096939a99b4abed7 SHA-256: 2b06f3a66f156ff5bb67c64d089b3b0cd545bca8aa78dde1af693a00951df494
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poxot.pdf In PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/5ad3b980f908ec57def2ce5314af0074/mutidukixuti.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/86280880425.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/nulutesekonotaxijorezax.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d5f5e9e22---64970814995.pdfIn PDF document text
    • http://yilip.net/userData/board/file/92548008959.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/33516570054.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cba683b58---mosafelalosujo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/96def60aad906030d0e0ddf3120aef64/64341486473.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/30342820421.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/466a7cl53ik5ujt88f3f2j4gt3/83809652601.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/62312519228.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/62666027544.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/83404363024.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/fagiditarizaxumupej.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/kuwafutalazijunigax.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/xebowezijumirafojev.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/xukarureporezeragudefufu.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/daxozokab.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a611100a056---6247151289.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/56931378783.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/totegerutuduxejo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751c478f279---jibaridekipubetosojasuvej.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/64134025055.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/tumat.pdfIn PDF document text
    • http://amajyuku.com/files/files/56703896927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=saiva+siddhanta+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_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 22464 bytes
SHA-256: 7899b316c5ff54d0c529fde959c1890ea57ee1aeaa3f2f008e483163ad8c8d0e
font_01_sfnt_off00013491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA8 10336 bytes
SHA-256: cd4c29fb7d51475d5b720ce8e4fbcec76286d353a7ed648f8a5e139fe163ff53

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