Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8b8475c2263b3e…

MALICIOUS

PDF

97.7 KB Created: 2021-08-01 20:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 952c106a6d342ebb8ab761bfbac6d55e SHA-1: 973a234111273269c669fca44afaf78323ab29db SHA-256: be8b8475c2263b3e627e9b7c56b96ddabe95e886f69c5caa2adad0de99f27a4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ketchas.ru/uplcv?utm_term=skewness+example+problems+with+solutions+pdf PDF link annotation
    • http://oumkua.com/userfiles/file/87659142404.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01e2ec076---razufegatujizukonezoj.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/nudirer.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9221276003be25c0782d4d40b51972cb/10651989515.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da80c619a0d---rutonafijen.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/73783467584.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/kalot.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/jidofuwakirovigezuwon.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/34947013605.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/kosulazunebenisi.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/8f141c231431b7901f6a071971837b78/51252411602.pdfIn PDF document text
    • https://tipresentoio.it/images/file/zupig.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/refuzo.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/43346255335.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080a425e9582---renujatigixo.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/dojupezitutomuvidajej.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/66716673582.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/wuxopunovupe.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/cd75snpq0dbjhokuh3c2kelr26/jazowiwor.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/0c54a31bc9f64b7884d6a33548cf13d8/mafubizugokolugegodulin.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/35351812093.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/takesimuvekemudabo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/a2c38l72v3pthag2or0u6j4o97/tafenele.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/3c6t90qk354dp1ntj2rnll74sd/57808273580.pdfIn PDF document text
    • 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_off000118e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 11360 bytes
SHA-256: 6310cbf5956fda8c33e14fb587d50cdddd8c8cc1ba74d9e424d835749ec271c2
font_01_sfnt_off0001333a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333A 17316 bytes
SHA-256: db242f9bbf95d67482caa82e34488c0b4b06bce63e5caecd075f233164de4fae
font_02_sfnt_off00016065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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