Malicious PDF — malware analysis report

Static analysis result for SHA-256 1820a4674ee297d0…

MALICIOUS

PDF

77.3 KB Created: 2021-09-24 09:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5d86294aa09ee0bbee7f212c3b019e4 SHA-1: 32ba49f12e5fde1360a93bc9ccc99239538da5d9 SHA-256: 1820a4674ee297d07d4c37aeaeee370b364cbf5b120fdbc71a7934ee0ad791d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to obscure the ultimate destination. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=suicide+squad+khatrimaza PDF link annotation
    • https://mountmoriahcamp.com/media/50165691514.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/64525428565.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/nevolifiluxokatoduwomanof.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/razegagazuxepadidefal.pdfIn PDF document text
    • http://araratmebel.ru/img/file/53443384108.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/55415331723.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8f672a6fe---38603465882.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497dcc8b0ff---40874184808.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/78180743366.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/geposijajetotujizisu.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/39718682152.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/bemumosajas.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/4c6d01a4873ea5d49980bb9747ab12a7/64589230443.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210914002824.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/a3734f1b99c3cffcf486f457fe555758/44286782518.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/46441726727.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/79111773948.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/wezenok.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/41506792868.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613138c91d6a0---93356235414.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/xedekinaze.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/bedirosiximufakigadatepo.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/da45f544fc2225c261f037247c31f7de/34175991778.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_off0000c9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 10836 bytes
SHA-256: 07b3c739962745346daf7b4b114519a33b8845ea72d2a772536ec458e9eb3cc2
font_02_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 17480 bytes
SHA-256: c181891e05a7c5f0acb9fe2a0298e2838d8083c56f521225e4242cf66df04452

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