Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6d93d6d49a8bee…

MALICIOUS

PDF

83.8 KB Created: 2021-06-26 04:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d5905dd8801e82ff9e74622dbe1b022e SHA-1: ac65bedd7949628c3f16010001d4643858ba96d1 SHA-256: ad6d93d6d49a8bee61f089125619f02ca64506169c54d2b0f9f6ff6eba645f6b
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The file's structure and link farm nature suggest it's part of a phishing campaign, leveraging compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/afee6481eaa81d930f028edd4a9c4cde/zusefavovedufoxamof.pdf In PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badccbb6e8a---66989529343.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d829b54e53---74328619718.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1a9a2ce5dc90526e0a3bc5b3f9d001eb/setogelimaxusaligefulori.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/zubupelo.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/6ac58714448009d77d7aee8018e17cc5/godideburadadopukevixinam.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4869f31737---18506850271.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/71610672893.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/753f1dda2757265c9217217ddc02fe41/17411059570.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/22547313670.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4e3463049---muwezojiforiratik.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/9tsrs5m4fcc279682vbu3ia7h2/burinebemen.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/sagulonirumesu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d083473079---15325593340.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/zorosomulixubivukej.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/agadih6khifm22ms0agj4m0gc6/60514148964.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/34696214d776feb5d75b429988ab35b4/kutusodivorudununumis.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/namofezojiwusunokabuteme.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/7cc8d3acdc5a49fa74b306cdfc17b17a/gubiburevigiwuvazuxa.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/5565cb88f5e88ec97d6813afee193f23/wadupubugopujojixuv.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160760bf5b9db0---vavoxujogawupefedur.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/49897954218.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/megapa.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/podugoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=expository+essay+about+friendshipPDF 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_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 16268 bytes
SHA-256: 6c879def23cb849fd8b04509851bf547ccf8c1ff70cb48e9377deac395845a6f
font_01_sfnt_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 10988 bytes
SHA-256: 11aeb65f64027f5c3967077c6a567a93f82998552b762b2460bcdf5feebf5120
font_02_sfnt_off000129d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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