Malicious PDF — malware analysis report

Static analysis result for SHA-256 b504ff2842aca3bd…

MALICIOUS

PDF

86.6 KB Created: 2021-06-30 02:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d1c77bedfee716859dd8dbc7b695cc6 SHA-1: e02087a9c9cb00831fb67a8d4f536920e966e880 SHA-256: b504ff2842aca3bd70ae243894d7e53525deb4ef6c6c9062312167c1a77e5009
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, likely intended to lure users to malicious content or phishing pages. ClamAV detection and ML classification confirm its malicious nature, with the URLs serving as the primary 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://chcial.ru/uplcv?utm_term=excel+vba+print+preview+selected+range
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/75bf5b9f8a52f5a963bdbccbea768cc2/82124279231.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/mozovumajurixefexuga.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e237pgopei9lfn7hrolv6b55ii/zofasokata.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/d76k5crap00cp2pjcohuna8pkb/kujituzeloxu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12c5e634ea---33871797160.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/49d0d4a6765e7030ca351bcfa065a5dc/84000715860.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a948d582162---59990567630.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/semaz.pdf
    • https://condominiovillage.com/userfiles/file/jugopafurufusak.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/95158965245.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f139300b18---23859283516.pdf
    • http://suacuacuonthanhhoa.com/upload/files/zakirodi.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f5032c3bc---sijimovo.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3a3720f918df9d48f3c267520984a754/bobinuverixap.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d6171b428---bewojalotadinukosagetetol.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2ced0698ef55a960adba84c5355210a1/90934159314.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c57008d807953a0b8b345e60d0c954e/31894498328.pdf
    • http://rauvuonsach.com/images/uploads/files/58156567432.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/bbd19cf1a87e4852e2e180645ea0f5b5/fukirawesi.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921946b0176---42501568805.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/qpjgv9ju553qpjna3pq3asmag1/25826461843.pdf
    • https://beyondpins.com/calisma2/files/uploads/pafinadoveresixebumoboza.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/jokaxewex.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6a402991---3869314559.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2120854518efe8013b97d63c8152ef8b/jegubibegemu.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_off0000ee6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6D 16792 bytes
font_01_sfnt_off0001067f.bin
7f04e91722142d18675de995c4bcf02e0b252348e0ec0ad078dc1438023176e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 17256 bytes
font_02_sfnt_off000133e3.bin
f5ccbb06ae61fc5efb2b17cf317628982e6615bd20bd09227cd1dfe5202fbc98
pdf-font-stream PDF embedded font (sfnt) at offset 0x133E3 10944 bytes