Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1803bf4f656aefc…

MALICIOUS

PDF

121.0 KB Created: 2021-08-11 17:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: ff0dc92196e6dd8ecaf5246583a956f1 SHA-1: a62045a002e6b4e9e832506f1da863f1abfce19e SHA-256: f1803bf4f656aefcc0cdb77f13a13a29552589ef48d2d1f182c0a1d9819e8c55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://synerhu.ru/uplcv?utm_term=premam+tamil+movie+download+tamilrockers+isaimini PDF link annotation
    • http://burrburroughsfamily.com/clients/55468/File/jiveko.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/zunolud.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/796355bcb62c0fed3697bec9d76c0334/10689056298.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/52271180296.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5911db3b0---35182942287.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4f132981---bulivumewefovebuxen.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fbfa6cde9---jibasavusegelagoxejusa.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac56d386a1a---40070939912.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845c0540a8---lizafosomijikujuvi.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/pevabapufekubiwirusij.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee67cd6343d---16417730671.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/54733623244.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/24726d3e2436079759716fd683d1cb1a/debezoruwawa.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/13968398198.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/21799615045.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210714_47A57C2A689CAC7C.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/wimefekebunukuros.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/28453611927.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d771e6528ba---gokupes.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/zoxivilatudipuvuk.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/22950397848.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/9ivlelo3s781c9uq1sbfg13ob6/xozapodipavukos.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/lilomuzaxoratukesov.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001442c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1442C 21744 bytes
SHA-256: 25823ef6846ad3d465d7cd2f63bba86cceae882f5205fa09bcc3092074817469
font_01_sfnt_off00016a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18278 10776 bytes
SHA-256: c0f556943cf581a0d06411f298d001ada65ff91859689c57bf22e908ff39ba90
font_03_sfnt_off00019b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B58 23172 bytes
SHA-256: 970ce073ec68e07bb03e21bbe2a8f164419b0cbfabbe6454502a37aaac20e33c

Open this report in the interactive analyzer, or submit your own file for analysis.