Malicious PDF — malware analysis report

Static analysis result for SHA-256 a532e4994f441d97…

MALICIOUS

PDF

84.5 KB Created: 2021-07-13 23:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 924b0fd40f9a38e431e86c80555aecd8 SHA-1: acdbb2509f7c57e434d0b77c66b546a8488bc2f0 SHA-256: a532e4994f441d97e565288524bb2eb3dde7b6b8dbf6781e295b6476f4aa7f26
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of a link farm on compromised infrastructure suggests an attempt to leverage SEO or distribute malicious content through seemingly legitimate but compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://triosms.com/userfiles/file/71186648181.pdf In PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/53658565977.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210705_8B6B27BA89159EEA.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc9d68882---simufakamewofo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ccd1e7d76---jegomigozodamerefobal.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/57809056530.pdfIn PDF document text
    • http://allasclub.com/campannas/file/90371041244.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5d755af0---29372959682.pdfIn PDF document text
    • http://charivne.info/images/file/tujiropelofek.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/21890704787.pdfIn PDF document text
    • http://cityfate.com/files/files/10673687748.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87cd380106---wagusesewu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cdb8ca13e---7700346303.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094156b06fe8---revaboxo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082fbec913e5---zejigowetaraxivole.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/15946329601.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc80c108ef---26138803406.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/depabiveti.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/34695210732.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/3ukt6rlgb16ke8v0km8iaftq5n/86420139006.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/uvhut49nteu2bh79rc36mg4tde/39314037444.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210622_0621269C97C2A18C.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/muwofumubolewikokufemasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+pen+out+of+microfiberPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 17080 bytes
SHA-256: aaa295fadb8a6b8bde2d4fc0b4f8139f646a65b9ba091068bbc8fa01cf2a2bc3
font_01_sfnt_off00011407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11407 10764 bytes
SHA-256: f2267594b627e10bf7c902087ca45640028756c12f14b5863623c60794b13292
font_02_sfnt_off00012c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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