Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbae05bf81327fdc…

MALICIOUS

PDF

93.8 KB Created: 2021-07-02 13:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c804e81d39f32eb5cdd419612c409b0 SHA-1: cdb849adae6fd90688e34c6565e9ea627dec51f9 SHA-256: cbae05bf81327fdc9d236158bd9ff33f14f0114152f70d9b45cf2ef83c974ba5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a48ac3bafe2---vetedalurubumevapep.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/162278715224.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160abf846145a1---tebunebilope.pdf
    • https://campermagazine.tv/public/file/vomirowuxobil.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608721e5ba59d---jadumikitapogu.pdf
    • http://russkiivopros.com/images/FCKeditor/file/33866091191.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16086841ee94c2---puginasanitofub.pdf
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/tamupovakefufofuwunowari.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f28c19b24698d6d48cac061631a61d34/52407653260.pdf
    • http://gursakaryahukuk.com/images/file/32119151489.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b491dc78e86b7588f7eb1af2eacfaa63/43325492716.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e710a107410d3e00942547bfdd5a8597/61884334304.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/hokr629j4epnt9b64mb6rteo06/buxomezomitesijotupofen.pdf
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/kemojirotapokibog.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cefb4ea46---27399335706.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b314c345e79---tiboxibekotidu.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7fda7182c---75899475396.pdf
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/lukopuferobopamipesun.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723042d106b---nivowapatela.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a9156c42a6a---88595121672.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/5499551696.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8bec88b94babebffcee9951c56c64128/xagamamefixanuzunenonogul.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c92980d5c07---9613614722.pdf
    • https://giovannicaputoboutique.com/file/93216723006.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=angular+8+interview+questions+and+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_off000109d6.bin
4844b7361af824fd4bcab8bb106f0f7656a560c7a74effe7518c61319f747af1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 11008 bytes
font_01_sfnt_off0001232f.bin
aa821a3da4a716954fca90f4dcc473d1404a030ac9ab9a5c2a2e3943b4418e6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1232F 17636 bytes
font_02_sfnt_off000151a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x151A4 16792 bytes