Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d22eb7367f76be…

MALICIOUS

PDF

85.3 KB Created: 2021-08-23 12:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fea3a02cffbe43694abd1ac8876f2c6b SHA-1: a6063a390fac08f8c8f79acdc974a5ae84b71e12 SHA-256: 89d22eb7367f76be0e3e27cef843b19772e25d2ff13af24dc93dbe87a0b3c67d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://teenmag.cz/userfiles/file/40602216709.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e80318a98fbd8e00c434d2d335aee08f/gijanomamatotuketifogugi.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/65911974010.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/dafuj.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/xutujugirubuluruvef.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16f786a5ca---sasaxad.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/63701459980.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/duxotizovajewizi.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/koponat.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf7ce553f9---zuzijigi.pdfIn PDF document text
    • https://aedwea.com/upload/foto/jozumidegipalorukofuligiw.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/82413134325.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160be76de5a0fc---19544839069.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/vetamujoparatobaxewuvu.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/57094388077.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f5e8d8652---32819527262.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/uf0vsgledb4tamhg8lgr5fva7m/sizezezutiwelo.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/guhal7e6n747n01evmuddgo6a0/6408641781.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021082206425337.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/62149878113.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/et1i18dpeqg43ba4kffg5lcpc3/pegoz.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160968967d49a7---penakivurenefotoz.pdfIn PDF document text
    • https://energooptima.hu/upload/File/xifatusaxixosizotaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=vacation+leave+request+formPDF 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_off0000e7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CF 17136 bytes
SHA-256: 81fafd3aa0a362b87db4ef62375bb4489bbcb77a5126fab93e9a8bbb1ea7f0c0
font_01_sfnt_off00011493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 10780 bytes
SHA-256: d05d6aaf962bf1e540cbb33d020f5c2e59b07e45dd706b8c716c2d209a469552
font_02_sfnt_off00012d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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