Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1db2ffe59db5c3…

MALICIOUS

PDF

84.3 KB Created: 2021-08-20 09:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6baefe3699599ee33ea506d706f523a0 SHA-1: 70eea46b84718b96b3eac4a6c023db83034b22e3 SHA-256: aa1db2ffe59db5c3fbaf03119512d9b2daaad13a8e2d0ebd0e578257f167b412
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with several pointing to compromised CMS uploads. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent, likely to redirect users to phishing or malware hosting sites. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://longarmquiltacademy.com/fckeditor/userfiles/file/15901813914.pdf In PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021073005534973499.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/43343909327.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/wurulifuzozozedagipoto.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/47649084458.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/89675493661.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/kumudumazoteb.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160872085d9bb0---mexuwipewobu.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/99245881652.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ed919a0412b0a06d9e99be35a3bcaefa/16971073497.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/fokavuxevolar.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6990f150082d07c46bf2ad2918cc245d/bizujofazozoporu.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/35217952247.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbe398d6f---labonor.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/53528901657.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160daaac2eaf77---kepati.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6mfka7vtu1ut6a0mjqv566bio2/rukolagitajidituketadivam.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/18790488419.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/20849759206.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608672cceaaba---92720805984.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/16354511169.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1d86eb3de---9784213745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pmp+book+rita+mulcahy+9th+edition+pdf+free+downloadPDF 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_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 11416 bytes
SHA-256: b45d9f02d6d3bc64f4bd6074d758f4dc1872efd3d1284309ab222c94e4a06065
font_01_sfnt_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 17320 bytes
SHA-256: a3b84baaeb1b643dd00831d751ca71c4aca4607f9a4753bb7bd308b3a76b2c57
font_02_sfnt_off000128c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1