Malicious PDF — malware analysis report

Static analysis result for SHA-256 3420bac7074acc72…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 04:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82883d55a01741689ea3c0a377749730 SHA-1: 6ede12e2aff0449c83acbe7a144b64971ad4a064 SHA-256: 3420bac7074acc72f5898bf57a73eb9dbbc527ded9081b7639d46176d6fe6113
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics confirm it's a link farm on disposable hosting. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://drafthe.ru/uplcv?utm_term=jesus+barabbas+meaning
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/v8fnj6kunkasphcd27tbkjursb/jalujuraziga.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088086ce131f---63451523618.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a780441020f---bumavaravitemebux.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/56cd0ab880875a5cde89c30ec423ea0b/7001243650.pdf
    • http://marinda.ru/pics/images/file/belivosilamaxot.pdf
    • http://mhinflatable.com/upload/file/mewanazebu.pdf
    • http://www.awakohchang.com/image/upload/File/ebet.pdf
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/pajam.pdf
    • http://nacyc.jp/Upload/file/85215841273.pdf
    • http://btfa.tw/upload/files/dukox.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa08af81a---punigoxodagogabanilepoxe.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb7f5308b---39250636283.pdf
    • http://perlawarmii.pl/userfiles/file/76685047703.pdf
    • http://jevades.com/aircraft/fckimages/file/12694154620.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f92a3d079---70009941134.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b751149bb5f---89727556567.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766e0c01f16---32517810643.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16070c00caf80a---tiref.pdf
    • https://watertorens.nl/userfiles/file/veverot.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160723c9c1cc0c---gigikabemusigalagug.pdf
    • https://hzautomatisering.nl/userfiles/file/javewamanidiviwid.pdf
    • https://balajihighfields.in/userfiles/file/47176855175.pdf
    • https://dhesient.com/media/95860035656.pdf
    • http://sys-svinding.dk/userfiles/file/32021289022.pdf
    • https://dailyhondaotomientay.com/upload/files/kidodikerojuxarusomu.pdf
    • 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_off0000edd7.bin
25d9b86c68642bd06c29330f37b4a36e7d886fcefb50b86aa085e9e5ea9f198d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 17392 bytes
font_01_sfnt_off00011af7.bin
8911a82394d3cdae1da76292af6d260b61fe2ee02886b9dac540789af2021e81
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF7 10416 bytes
font_02_sfnt_off0001328f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1328F 16792 bytes