Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dc05a09d8f32f2…

MALICIOUS

PDF

72.7 KB Created: 2021-07-15 17:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21b45ceec4ac601cea8a8f88e71f6c68 SHA-1: cd1b4d78afa208061b6013f1755d8ebe21474262 SHA-256: a4dc05a09d8f32f2045f46938cc3f495b7a9f91b47eec0dcb188f80d0bfbe76c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/36faeea24ac412461f76373904e9fca9/pawad.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f817f2b6---69825642272.pdf
    • https://ystechpro.com/nbloom/fckuploads/file/64308401865.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074adbd8b19f---topiwafi.pdf
    • http://aliceinformaticasrl.com/user/pages/54628498802.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160886ccc3be54---62488740447.pdf
    • http://mxm-hosting.nl/img/editor/file/vubar.pdf
    • http://mobydick-band.de/fckdata/file/11006782348.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/karirawuvus.pdf
    • http://nmglyxx.com/userfiles/file/17990122894.pdf
    • http://samafb.org/uploadfilefiles/toduzigovogirobuzepu.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/0ho04hgachegbebhgv91oi9b5q/49528678106.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e3ad3f277b80ed5b6bbcc4fc42597e8e/kulonidewojopa.pdf
    • http://eska-lift.ru/userfiles/file/17736587541.pdf
    • http://say-international.eu/userfiles/file/17036081079.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070394ad8d1f---23251854441.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1f260bae---99808107338.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/tokmqee4o1u8mkja5q6rbmc5nr/32773334032.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/96621298438.pdf
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lutanuwegawuxevebori.pdf
    • http://hotelbellevuepalermo.com/userfiles/files/34573788726.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/gog4g0rga612p5b1ncuhj4mv00/28023295468.pdf
    • http://capmar.eu/userfiles/file/92630744208.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c34352e6a84---7634363483.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=note+taking+guide+episode+702+answers
    • 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_off0000b73a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB73A 16792 bytes
font_01_sfnt_off0000cf4c.bin
540685fb28fcde9749bfbc0e483acf91f020a27ee8752f4b6608061878b5e97a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4C 16884 bytes
font_02_sfnt_off0000fb67.bin
372af25bcc0256c5cf2792f185919853973bde3df1d7f917f31ad8ffe6f33862
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 11068 bytes