Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e50e71da43f206…

MALICIOUS

PDF

91.4 KB Created: 2021-06-27 14:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd3f343177e53a7ad29b663b3b0cbf89 SHA-1: f846b7a22c289b06ceff3d97f166a22ce5201e8c SHA-256: 94e50e71da43f20694aaddd8444041cce78393b5a54ae7b2ad5a0682d633d73a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of link farms on disposable or compromised hosting suggests an attempt to obscure the final destination and evade detection.

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://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/717860d44da33b8fab9f6b6d6173fddc/favajezegobajevimisuk.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d6662240---binexasinovoba.pdf
    • http://www.stemcellhairclinic.com/files/files/tasetafedomuwuwevu.pdf
    • https://drsaman.com/files/kabominumaxukipo.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c29ebcde7f6---nudoxuxuliro.pdf
    • http://tubietelbar.hu/uploadfile/texijebagovujodawigid.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/lv8a2f6al31d3dts4vbhhjumvj/keveridunuba.pdf
    • http://atut-biuro.com/uploaded/file/83941109742.pdf
    • http://alfavit.tv/userfiles/file/74044446249.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085789474a78---18910947150.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3d8ca86ed---46413556391.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/abbf708dea6f2daed7446bdb3231af71/nasew.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c643ff841ad---dedewawewugajezitadag.pdf
    • http://capmar.eu/userfiles/file/11920060561.pdf
    • http://hasyo.net/files/file/mifoxonadagixidanematod.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/73b8afebb4f2511b2f5c1575dd437c97/sudowuvinosefatumunebir.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49626d1259---41345670681.pdf
    • http://sharise.net/Uploadfiles/files/tigumepupixejukasa.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1700a35c6b6156f320f47fef5f58246d/59702219920.pdf
    • http://zge-led.com/luodan/images/userfiles/file/63674803645.pdf
    • http://archinfo.ru/uploads/file/26343662312.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/9e7b5ad1dbc7a023fe86f1f9ccfd02f1/zatekuwesajalek.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e9603a9a---36623589187.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2439772eb---64871275234.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=class+9+science+the+fundamental+unit+of+life+question+answer
    • 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_off0001021e.bin
81c7152b696a32ab733c7f9a18bcb3f650daa957fc148123e09442d58dde9b4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 16732 bytes
font_01_sfnt_off00012d5b.bin
39bc790162f2b001f1beb23bed60693eeba25a7327209291dd90c7617ae6d6cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5B 11272 bytes
font_02_sfnt_off0001477f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1477F 16792 bytes