Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeee7d37c5f17db6…

MALICIOUS

PDF

114.7 KB Created: 2021-09-16 15:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d000df6f6928f065ce3703818c70e9b SHA-1: 2de25042fe0ba3cf7058181efd8ca91ccfc0f851 SHA-256: aeee7d37c5f17db6fc75de668e85d70c0f5b3772e8575dd22999cab1dff61207
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ecableapp.com/FCKeditor/FCKimgUpload/file/tatovuzoz.pdf In PDF document text
    • https://heyratacademy.ir/file/rolozidi.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/gapanenudivuvenew.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210905033845.pdfIn PDF document text
    • https://mangallagn.com/images/file/77071026793.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/61946596515.pdfIn PDF document text
    • http://labradory.pl/file/dujeb.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf313958b---gomosiwapadewex.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/vamewobewukoken.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/60839759440.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/82493181428.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/zefogapozibuxozi.pdfIn PDF document text
    • https://km2804.com/ckupload/files/1288405507.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ca91436f---lolavasuvifadujexux.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/53357173394.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/kevozag.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613146d1bc3ce---31266670993.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/buxurebip.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/54902182299.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/28694335753.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/tebalipuvajumu.pdfIn PDF document text
    • http://salwex.hu/file/50560475698.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/vefeduzikixod.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/lizin.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/31541597807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=jurassic+park+builder+play+onlinePDF 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_off00015971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15971 10848 bytes
SHA-256: 2c5a3e4a09fb3794d7722b8eef246f05ed9c18e17295f05fb1251cf5de13984d
font_01_sfnt_off0001725a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1725A 19220 bytes
SHA-256: a802356703d9d421ed551d48aeebb0ab4b83b5cd452adb792b2b8c5fccd485c8
font_02_sfnt_off0001a4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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