Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c10fade91029601…

MALICIOUS

PDF

79.6 KB Created: 2021-07-05 04:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 446267357353f5c608071d2e34af0a92 SHA-1: 14831e22d06125906a88e859c37e8161191cb319 SHA-256: 0c10fade9102960113e8891c71ef48b3af13f089924e0de1eb117400dea818ee
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to lure users to these external resources. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3ff5261e05c8dee38133e49b7beff179/76396238873.pdf In PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/gnkc3fn6s9hi3vvo0epih86bm1/radunalesamukuxekilagizut.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/69d6261103f59b6cd61ef34e3826c9d7/dekoru.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/fixepofapevoxibuxiba.pdfIn PDF document text
    • https://asiajitu.com/contents//files/27459002560.pdfIn PDF document text
    • https://biocoils.com/img/file/10425855976.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/jidevunulukipabavazekajox.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/sawepumi.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/punova.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/nubatolululudowi.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/8f0557673ae549cd6b26f52cf4ff1036/52301778937.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c33ddd3f9---rumubazo.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/45fc771b6a4c7307fb2986f025c16431/kexafubelataxadojola.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c319d698ff35710736baaba8a2881156/sugop.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/kipukubolabubujusano.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6cb5f6d48e834e5f1bec9e26fc8e436a/60600647454.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1c1a8dd397b2156d29cdc8150b4dcee4/regosoxuxuzisunedokamepo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade144d66b4---magelojikided.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/gbc26evq5ilc897i0s93a613p5/73858420546.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/15371315765.pdfIn PDF document text
    • http://surtek.biz/image/files/20150119_145928.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/pujuvuzazimevidaj.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a7f66f092c8ee2fd4d112e929bf872a1/fomibuxovetikusixulolunix.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099ead16b420---39719457992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=none+at+allPDF 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_off0000d2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 9716 bytes
SHA-256: 6c228e7956486556197f8b3bab79ddee67250f2b2fbf5d5e5ac1d1963e85577f
font_02_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 20112 bytes
SHA-256: 2fc77231d6f705d53f0de019b030953e2f861389bd1fdb0257a0fd3d5ecceab1