Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6bf0bde936b0f6…

MALICIOUS

PDF

114.8 KB Created: 2021-08-01 00:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6969e1b62e119cca77e5db47c8384f71 SHA-1: 56b0d0cba13bbef17dbfeff52dd9e07a2869edef SHA-256: da6bf0bde936b0f6baa08665f9e040bf38e555bb4ae2a49f8f95e123daebe6bd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier strongly indicated maliciousness, and the link farm behavior suggests an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://www.asslar.de/downloads/xidujixifipepivowu.pdf In PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72929c278c---sigefozukef.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/64iq2goaiuh4u1gdss7q232ob6/gokolakepov.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/65221512607.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/52648202038.pdfIn PDF document text
    • http://jucal.es/images/file/85195654386.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/19495698696.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754953230c1---dakano.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b1e2483df28---98461419688.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/xuwarepetejegag.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/jutazusadiwovadomojin.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86f469f58f---vekezutevumetenazer.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ea5c88b7022aa91d1e4e2d4c7003e2a4/83555158526.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/tomulafegisidigedi.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fcd52be398345b7945a6a4dd77ee12d6/94589132949.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/2d4278356232a92db693442412fd7f62/38408198303.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/77934477907.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/90616954051.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a82b3a289cb---6673979572.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d57a48b2e---neletisenokirotavewa.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b4a98ad7dba7c245a7446634b1607aaa/delasivijuzibosonemexadi.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/xupomirud.pdfIn PDF document text
    • http://brukbet.com/user_images/file/ludosuwanar.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd510301e66---wiruzaroravik.pdfIn PDF document text
    • http://camwater.org/media/files/fevejutexobuminuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=a+dance+of+fire+and+ice+freedom+dive+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_off00015ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE5 18524 bytes
SHA-256: e5381287bbc8d4d93b405e56c684066071a2e809397f98cdf138157fd568eb0f
font_01_sfnt_off00018ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CE5 10504 bytes
SHA-256: b6579f2af980925a695fd250d33de307b698a52e30a35ff142bb3525a5a062e5
font_02_sfnt_off0001a4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1