Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b48679282e8662…

MALICIOUS

PDF

85.3 KB Created: 2021-07-01 00:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9585e10da8e504c44d6a9fb94630464a SHA-1: d0249d500ad03765970fd2612252dc581a09ac5d SHA-256: d8b48679282e86623966bbf2dc682c0ae41c48bef56fc50eaa9844afe183373e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://eyetracking.pl/userfiles/file/75303776788.pdf
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/kaxajolusorejozotagomuzit.pdf
    • https://stillwaiting.org/userfiles/file/65434382321.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767cca379ae---gijobujaji.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/0876111327dcbb38dce4b90804d798c1/xeriwuwi.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1411cf9bd---nazigadi.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e91a527ebc---14791976266.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/9t29kk04q3s87830q5dkripo0b/vedinorej.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/85111304642.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa9a9a6f10---libidajatuxoromolebexil.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/92bfdc775846abbcd349a378af13300f/63239580180.pdf
    • http://mediedil.eu/userfiles/files/fusujunonugebivejew.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6a05c793---xafimimesoxepejog.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/e7f62u0ugtk110ppc8tcq1lkh1/nijowakejini.pdf
    • http://1959blackshirts.com/clients/866684/File/wumovulivepaz.pdf
    • https://gemwares.com/userfiles/file/74199853043.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607137f28c43d---gexepopok.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf18f4aa1d---niridafusikepoj.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e62623e8e5b38c7f84c29aa524b0cb14/jerodalujo.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608143d4ae60a---revixodunuwikuxove.pdf
    • http://innotack.com/userfiles/files/vazam.pdf
    • http://barcelonasixtytwo.com/userfiles/file/nilugiziz.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/um9m89ad6rtq5pv1n3113mft8n/92589018618.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=high+school+english+grammar+and+composition+download+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000c6ac.bin
a0f978eb22c81831103295dc760f3c1871931e1d16ab8f84e982eb5b2e3c0b39		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC6AC 20304 bytes
font_01_sfnt_off0000e8dd.bin
0098c2c5450a65fcb6a99c44c55762cead2dfd761b400810f3c9fca5b8e849c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 11144 bytes
font_02_sfnt_off0001027f.bin
855c8b9b81150e9db6d24799f54874ba2a95a639f8b62f10d5861cce48135504		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1027F 17184 bytes
font_03_sfnt_off00012f1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1B 16792 bytes

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