Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd86afc3209e711…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 01:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9d61e9b9de1320baa427b0244ed912b SHA-1: ff7453d2cf817ddbbf71f6b6ae95d7593219f6d1 SHA-256: 4dd86afc3209e711b14a9f3626ffc25067a24fd38bd5bc3962efb3b131070f48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The file's structure and link farm indicate it is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/j6qr3nqr6pvtev4u8ljj10uu00/lololagigan.pdf In PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/5a380bb982e73898ba6f76db9b44c1a1/titodakosasajaralut.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/zorux.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-07-14/images/files/zigibarepul.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/sadebezufarisomiranilixu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/10af5fbba1ac52879721e3eb635dfef7/nogeriwi.pdfIn PDF document text
    • http://bougerpourstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/luvexadex.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/35621334123.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/sirebubaviginatosegiwane.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210814132742116.pdfIn PDF document text
    • https://e-midas.ro/files/file/3457582252.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9293093b893945c42a7f6f499a12f4e7/sepiletumidunezet.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16117789aab3a6---zisefubanakesevijovo.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105aac282f30---miwukexizepizanukaropefo.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/42867154924.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d051c172---zoxulex.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/83028484039.pdfIn PDF document text
    • https://network-italia.it/file/gogov.pdfIn PDF document text
    • http://bronia.org/userfiles/file/4179118281.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/83894432242.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/72600149751.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210610033638237459.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/nelifenetoz.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34968a31b0---87320289860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=reading+a2+b1+pdfPDF 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_off0000bf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF76 10500 bytes
SHA-256: f200ac9bd4421d998208f124bf902614629d143acd9dd51cba42c03a98f1ecc4
font_01_sfnt_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 19736 bytes
SHA-256: 5974ee9fe46b0013e34878e5b9de9eccf9db101cce5f7858a3eba3c3c1f9f18c
font_02_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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