Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e47b76580ba3d5…

MALICIOUS

PDF

86.4 KB Created: 2021-06-28 06:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4245169cfa325f9681024760d123dfc SHA-1: e3ef29c55ddd2ce1a4762b565ba2d962dc048866 SHA-256: 56e47b76580ba3d552c37d5f18d8b5fdd0b0dacefa0469828fc0bd14843d52c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=the+quality+of+mercy+william+shakespeare
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/2c27154071148acafb4e247b22d889a0/85700675031.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1f47007c2---43537899612.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/nabogafalu.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e928eaa3902425eb19b0237551e3265b/79497718727.pdf
    • http://annassteen.com/ckfinder/userfiles/files/20317533210.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7ea77eaf9238d4b3d923cf05ec4049b2/lagatubovozokexab.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1877026fc---23384136047.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160753193bf6a8---876344584.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41a1cdee0---8078772420.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a79921c844b5113f129837d47392658d/93017839367.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6f488b4dc---8976209358.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607deca56e5d0---98620386112.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d61b25eb1---1747714365.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e62e867e90---nojuzarorid.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607510592e653---18234585374.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ja3bf8kgo5j0j8ako2fhtmkvl4/75188046244.pdf
    • http://arkystudio.eu/userfiles/files/sabolusatugikapagori.pdf
    • http://bigsvatcharasith.com/userfiles/file/xiluvomakuwefexurikepobi.pdf
    • http://grandp.ru/userfiles/file/12088906103.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160756979e3990---8029661945.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a995c31e257---30225611431.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/3d8a640be1bd05af0bede94c426abbc4/17680107540.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/32e70e3fb137775271d0aead55e7dd79/rufawekagubekerajogole.pdf
    • http://champagne-marc-chauvet.com/images/files/gutugilimemin.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_off0000ebf7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 16792 bytes
font_01_sfnt_off00010409.bin
1cba151386c64976858b0cc1e3bd6e7b6fd56b41b92cff1d5f843510ebf6d079
pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 17864 bytes
font_02_sfnt_off000132ac.bin
f06198dcb5c1f70b88274866eedcbfd3a93e00d3c383a5522f39f4440bcb7783
pdf-font-stream PDF embedded font (sfnt) at offset 0x132AC 11140 bytes