Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15b6906f19e7b6d…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 18:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 826721357b200ce4812a7a9f3e7b5b0e SHA-1: 94a131eb665975d09bf1b493010a7d273d000454 SHA-256: c15b6906f19e7b6d890ea69938e9dd5fb8a3048f4a19b3c29419798860acff86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=minhajul+abidin+wasiat+imam+ghazali+pdf PDF link annotation
    • http://www.neocota.com/fckimages/file/liwiwexesexunepobagekajub.pdfIn PDF document text
    • http://mfahk.com/upload/files/dutonizeparufupu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/ee6b055cf62166aba924a0001b3abaaf/68435301769.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/gakebepudeg.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f69a999d6---mowafenedifutib.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/zubumotanipinekulozigan.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/53t3hn8hqfe8urs6mha0vd0bb1/31210961911.pdfIn PDF document text
    • http://synphabase.ch/upload/file/25150720770.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/mujuziresatomu.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/74716151528.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/xefos.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/28fbd88f9c198821121ebc331e9244f0/tudifirasenab.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/78867961671.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/89215066943.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/bbbcd82bf72a1c62d3a04ea10560bb92/livixamifapelirezoziwojir.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7803d3f5a3---63799483737.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/minosove.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/e88d99323dbbf6732fcb2fe1169e8e94/72031287526.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/e0kbk3i0ivq12i6ltm3v95tnuk/pudodimijidoxinanixobiz.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/gusiwezilibimefo.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ba5017e1d2bb5d4e674e3a40999190f3/61089202241.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/14345282925.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/dererat.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d5cca4a8a---94082373921.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_off0000cf0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0E 17488 bytes
SHA-256: b9c00a7fa98c07bb77c048e081a17a8a9be5dbf622e9f74b6f0439d253af5000
font_01_sfnt_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 11104 bytes
SHA-256: 97a32dd6ef4cc4b72afdc2cac4d6213f05aef4a5a8bc52ed7346d53a58d40f92
font_02_sfnt_off0001157b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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