Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cdc2359343114a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 10:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a1d079bf319367a61c846f770c503c0 SHA-1: ff38994e48517f9f57a74c3618f96d1100dc3deb SHA-256: 57cdc2359343114a0f9564a32b119ee61a7eb9f7c73ff8a61fcd743db4c69787
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ideylia.fr/uploads/file/jelibap.pdf
    • http://habitat3.eu/userfiles/files/48510350347.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9482a7d5f2418238481736dc6a29935b/58282000218.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bb09abb9fec---85069904937.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/tppoaarvbq74llia5kfhu9ku88/xuserebatemexeveruxabataz.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161004af753f66---58545373598.pdf
    • http://datev.hu/ckfinder/userfiles/files/sativutidajadupet.pdf
    • http://englishplanet.info/ckfinder/userfiles/files/25641922043.pdf
    • https://dellrein.ru/content/file/15382182309.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/lfc17opedoakmm5foo48q0mbh2/dozetetavutizumagifiru.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160749ad257de2---39888459771.pdf
    • http://vita24h.com/uploads/userfiles/file/xilogojivaxexovive.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/aio42qsl163c7jm5lt3fksnul4/nosizilokijaguzosadi.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e6f486e6---12810077553.pdf
    • https://quizai.com/uploads/files/jaxodojiwalozo.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/32497495194.pdf
    • https://medius.sk/userfiles/file/82199240120.pdf
    • https://laptoptranganh.com/data/dulieu/files/lisuzuzureramaxabosutoru.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5308abe2cf---jikowozodi.pdf
    • http://www.findvoters.com/userfiles/file/muvukamilisinekis.pdf
    • http://siamsnail.com/media/userfiles/files/duvakisor.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/be352e908387cf12c38ac219729387ce/sugozibojodisegipunir.pdf
    • http://dxline.eu/userfiles/file/53044587819.pdf
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/65089572751.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=southwire+overhead+conductor+manual
    • 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_off0000e230.bin
5c7cb3dad6a932e0fce237001721f11ae5c4358fb576c5f31ae272b48c2d6d15
pdf-font-stream PDF embedded font (sfnt) at offset 0xE230 10796 bytes
font_01_sfnt_off0000faf2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF2 16792 bytes
font_02_sfnt_off00011304.bin
8b83102e3252315a753acc19584f36f56806893b5a6da5f601c107298a00046a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11304 18652 bytes