Malicious PDF — malware analysis report

Static analysis result for SHA-256 d230a49202faf2a8…

MALICIOUS

PDF

85.9 KB Created: 2021-06-29 20:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 248f9769aef7478643105c79eb62f848 SHA-1: a96f02cee5884c9c593252889be33322a5a67c69 SHA-256: d230a49202faf2a83d6104983127572b9105446086c68895208003157ce59e70
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, likely phishing-related. The document's structure and embedded URLs suggest it is designed to lure users to malicious content hosted on potentially compromised web servers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/f707dcca5d1d90d3637b9656840dfb94/23541357846.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hjbbfhd00pam09spfrejf0qvu4/dubinazi.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2531c6da11---51712821012.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/kan5u7fqp9bobrf9febio3qdtl/63684189784.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5b696895f415bd5a65ad0a12338aa77e/gikotemitetulixivelati.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/25834775609.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/17021646492.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/26965852521.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de7eada244---27378430413.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/65039561413.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/52030192931.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0a566039f---51488459812.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/bh1pfcovj79a78us0gn6r8ib73/kasuxibawigubibojed.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/584c117029ad4d55e86b45e4f26c497b/sinaxutazevamikewi.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/6a4ec1a4a5c40410560d36776631ab13/45820374393.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b50acb14b471a4501c686158b171abf0/30882281578.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/gewefokokunamegofusim.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940541371c4---fopubojezola.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/sbj54pju9cmgc70g4p8s0j60po/10180167145.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c08b5584130---baxozuwazutasawox.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/45352837501.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160885283f1523---1728167395.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c74173142f3---kolizowor.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/31229015849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fraction+addition+and+subtraction+examplesPDF 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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 10992 bytes
SHA-256: 2ccb0235300e120b3d166a000dc5e48ffeae851eb7f1858a527be437c86292ef
font_01_sfnt_off0001058c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9E 17092 bytes
SHA-256: f0f862a180306d40c9c7b7b1328343024dcd9d649bbd6394a0133f6b33a73cd0