Malicious PDF — malware analysis report

Static analysis result for SHA-256 115d0e637b75fe3d…

MALICIOUS

PDF

94.0 KB Created: 2021-06-26 09:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26c985fe2fb6aecd8873bbc30bb9e05b SHA-1: 872c7eb5addf5c18acaa2adc40538af4436e08f3 SHA-256: 115d0e637b75fe3d2b855dff9bb00e40cf31d8f0f8d665c8743d44127b0a611d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document's structure as a link farm on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f27fc61a4985e82128a58c4814d09217/38605290228.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/ef333c9683651bb4842673672714dbcf/97158629123.pdf
    • http://beerskiboot.com/img/upload/file/54959573886.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/8229ce71b1a41c8637bdf9b51976abb4/sufeguzenolirivodesik.pdf
    • http://metabolit-plus.ru/files/file/71274584712.pdf
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/varavamelijeguzivoximabom.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/c7b53a58489ce4ca0e1722bc8fa73b1a/42017431662.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/m65mgt0ob3mnbvtk3vmmbs7s46/furumudivevexelavafale.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f727a1c5b1---wukakom.pdf
    • http://ehomeforeclosure.org/images/file/50191098402.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d21d11024---64846073294.pdf
    • http://ccswcd.com/userfiles/file/58293404411.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ff851c45134879c80e16b96a82570502/14576911620.pdf
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/85246351320.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d14292ca99c468caadc5cbff1abc7a68/belasimokugegojiriluzajo.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a972a760ca0---27934351890.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609619d90202c---wenajabirakitedes.pdf
    • http://metaglas.kr/userData/board/file/duvazupadazipe.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607499379eda1---79638153404.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160926cfd7cb6e---sololanasirigepamuvo.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e397a08d88624ef99eea95ffae46233f/vexipopewesanifuwuli.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0eed3a78c---tavevugofobadegenufumi.pdf
    • http://alituncer.com/userfiles/file/52166559511.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5adc5d9ffb---13305082743.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/pos0ilsu72k0ca8cc66ijipva2/3159655379.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=automated+factory+robots
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f31d.bin
e4e0325a7ca549e0c1c48a23299ca9082a1df1c404377a2fa8d347cfa19f2f8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 10732 bytes
font_01_sfnt_off00010bdd.bin
caac605a95a4d5dcc2a4fc90459cdaae0f096ddf82a35bdb25dc88bff5f2391f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDD 6484 bytes
font_02_sfnt_off00012238.bin
e7c7b7f3e9fef0a094ef90b0548c013c97faae4d6e6ad656e824ab1b849ae7e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12238 18596 bytes
font_03_sfnt_off00015283.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15283 16792 bytes