Malicious PDF — malware analysis report

Static analysis result for SHA-256 326448b208202a7a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 00:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e1a388859c4ac809e49ffcbeb17c280 SHA-1: ba0ccf89f7390afbea720d438c32346c9f5d5bd5 SHA-256: 326448b208202a7a63eae1691ca32299ee019d4321e5ff8700cef60810b66906
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs, including those hosted on compromised CMS uploads, supports this. While no scripts were directly extracted, the overall structure and heuristic firings indicate a malicious distribution workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 http://pelesiuvalymas.lt/i/File/67286599245.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e2d4b35de5309bcfe09cd70dc2e28f14/pafubarovifufam.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094895d29378---83270821272.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/fruolqnh18pd0luemlc347mcij/49997998119.pdfIn PDF document text
    • http://jar-ted.pl/file/lilexaler.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/nimivujuvaxu.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/16313533791.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160d377be1818b---derogikanipake.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c024c709d84---vagevevileluxexilizodigit.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c114fea8fef---zanogulilel.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/jusimaxirozujipojajarapi.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/retugabo.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/2il7uqg229d7oeo46chga89g6v/84782486707.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/87db998cc1561ac6bdb335639da17016/bipakegowukesilowelopon.pdfIn PDF document text
    • http://fxmeat.com/upload/file/e83711566b86165b0079bbe783da2973.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/peverog.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/8652251786.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/51643255617.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/bazewazus.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210606184213423.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b0a57f5d8542762ae1dcbad8262f47e6/72114289670.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d97790b7b95---29160674211.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f079fda6dae---48103393757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=backward+counting+worksheets+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_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 11184 bytes
SHA-256: 90ff74035e29420add8acbc36e9cd2a549e7a3c170122efba41c51d89768777f
font_01_sfnt_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 17884 bytes
SHA-256: 2c482c4b667727523cb1411b2cfa720632c53778dae4a67352323564dabbce9a
font_02_sfnt_off00011aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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