Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a335d4d9e3ed13a…

MALICIOUS

PDF

131.9 KB Created: 2021-07-01 00:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a428927b76ec2b86b10d2ccfb3e8e978 SHA-1: 1e9ffdd471a9b7629ea436f7108b37f6dc11b62a SHA-256: 2a335d4d9e3ed13ad15c8ee7407863c50f89300ca5e2667ea18f033dd184b336
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware delivery. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093a16f229e1---jixokeduxipuxewulomigu.pdf
    • http://papianiarch.it/userfiles/files/97453451946.pdf
    • http://dharmapremipariwar.org/userfiles/file/lofijawotimotoze.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fcefd521c---ponulisagalita.pdf
    • http://extracam.es/app/webroot/arxius/file/xewegonaxasitezu.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c239cbacdea---wafewebetedidenerozuxor.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e88e2c1dc2---jobigiramomimovimo.pdf
    • http://thangmayedex.com/webroot/img/files/63301523151.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b00ea25887e---biwilef.pdf
    • http://rustproofingottawa.com/userfiles/file/veremugevatoxoxu.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/ed3b75dc3112666c0d687b9116405d0b/xezuxumisetowavoxef.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f26b90fb9---powowenajexuvag.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/fbocpa2kio9aoqhdr3esm67asv/56404352293.pdf
    • http://aliceinformaticasrl.com/user/pages/78282424915.pdf
    • http://www.northern-japan.com/image/upload/File/92817824367.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/45b1cc76d804f783d1a3e9874869f974/46825336562.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a129ae52dff---20062382398.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5b737686c---mexoxugilokogenevenafu.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ace764595---lagibuvuvevoramanorid.pdf
    • http://hiace-yoshikawa.com/js/upload/files/dadagisar.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5bf2d6add---61893082999.pdf
    • http://veraschwemmle.de/fckdata/file/zazagit.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085b28328852---33733011894.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=harry+and+dumbledore+in+the+cave
    • 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_off0001a14f.bin
f94e1ba2d9111c67b78988d5ca95d6969f00f0057f072f3a764058c86a336341
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A14F 10876 bytes
font_01_sfnt_off0001ba2b.bin
0a284ef85736be32dd38f22094fb75cc01c5da182b22300aa6481cce9ae5df89
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA2B 18580 bytes
font_02_sfnt_off0001eaf2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAF2 16792 bytes