Malicious PDF — malware analysis report

Static analysis result for SHA-256 73677297c426047d…

MALICIOUS

PDF

92.3 KB Created: 2021-08-10 00:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4fb41725f6a1f15ffefb71f8c84170f5 SHA-1: 05c80cd7c618aac6a0b94039f8279719a6aaa389 SHA-256: 73677297c426047d503894b783a0a3fe13eda1710c6e910a772895b137ec0004
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier strongly suggests malicious intent. The primary attack pattern observed is the use of malicious links to potentially redirect users to harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cructi.ru/uplcv?utm_term=does+leo+valdez+die+in+the+trials+of+apollo PDF link annotation
    • http://pphu-joanna.pl/fckpliki/file/52688777748.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/10lqjb6ogr7v5igrnapvk7ddk0/gegifobosetivekawanepeg.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c3b3cb0c7---tipudojepanopeganex.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/cuisfpnqscq7lk2djo2s6761ut/76455584463.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8eed6e6aa7a372098414debbe1301e90/92159761174.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1627056392.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/20775689906.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8bd3c7e44e---womolatuwaj.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d431953509a---23899853763.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098418de564c---kovugat.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/073ed43fe4356e90ac129f512348066a/kabar.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf89e5bcc---pupot.pdfIn PDF document text
    • http://poorclarescork.ie/images/26946413136.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/taguvosovaxanedix.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/afc764723cd8f4fd5ca065be810be1e5/82276990552.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/64011b5efe3dac8610db763e16ee5da6/75284928383.pdfIn PDF document text
    • http://vinmexindia.com/uploads/tatakovazitowexafabexaru.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/xosotevokinabago.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/90782411404.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/bajobasuvopewezurujefobi.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/47122026820.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c29f2e4a520c4a6b056f386663f687d1/gonufaloluxususawobedav.pdfIn PDF document text
    • 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_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 10724 bytes
SHA-256: 75bc1a301b9b05228871d4519f0c25c892e498dcb182c7cf63bcdd02bdfd771c
font_01_sfnt_off00011e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13687 17156 bytes
SHA-256: 17212b321ddb79f5141dd02378f96433a56795cf17c98d6a1ee8c26fc1f9fbb5