Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b82de38d3e9e2e7…

MALICIOUS

PDF

84.0 KB Created: 2021-06-27 02:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96a527daa9d2f319f34ecce5f383ae93 SHA-1: bc79afea3769b64bdda3acad8524b38bdeef224b SHA-256: 5b82de38d3e9e2e788e35c123f57e8ed1a3b6bbc7d1bedccced5ae92680ccb7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress uploads, suggesting it functions as a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to malicious websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=chaplet+of+the+7+sorrows+of+mary
    • http://alexandraharris.com/clients/36054/File/kemupazaseve.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc55d272f---99712894976.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d6035713c---34359146502.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb08485ca---75087046542.pdf
    • https://fnb-concepts.com/images/uploads/files/66114646611.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160930c033bd6b---75242107961.pdf
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/nanogobesage.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c022b09e117---putezok.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/12f2cd4637cf385d2d375ab7a847001d/91040749410.pdf
    • https://avgdesign.com/userfiles/file/sidinatojudizuwuzaxuxag.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c5a8aeaeb---zijowetivafem.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e686327669---wesemipenulasinazo.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0b84a429bdc2ba96f5192620eaad4049/49963766946.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/92b7ff355d9377e8b6e41c492b53a085/59512583102.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b200377d---1015525560.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/dd5b2b2fd11999d59bf5fd5fef6650bd/davijefezevujuzamomi.pdf
    • http://mlsy.cz/images/file/files/baxepomokunimexujo.pdf
    • http://dentherapia.hu/files/file/sulitasewutaxi.pdf
    • https://eyetracking.pl/userfiles/file/fimabatogusoxunab.pdf
    • http://mobydick-band.de/fckdata/file/bukunuxemepidulezevi.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baf589eeca---memepefuluninubenesofixot.pdf
    • http://thankschicken.com/uploads/files/45397389468.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_off0000e603.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 16792 bytes
font_01_sfnt_off0000fe1a.bin
2fd7ab137b8d142d1155a1f4adeb2a97031a7fedf38de9bdb886deef28d6e9a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1A 10708 bytes
font_02_sfnt_off000116e7.bin
6960979bfc54ad6c34a010b4dbfe60a70b2bf20dfdbfd133d4f8986850046436
pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 17064 bytes