Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff682990e93001be…

MALICIOUS

PDF

82.6 KB Created: 2021-06-30 01:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6486736a23edd94a56e53f1cb8148b1 SHA-1: b740c0eca5447dba6a6417f090c0fc1696a9a85d SHA-256: ff682990e93001be853c6d73e3ccba5f75c2634d02e356e1dcb7fa1668bcfab9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the final destination and evade detection. The presence of these links indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c467cd1f631---14045401829.pdf In PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210620042832.pdfIn PDF document text
    • https://luminex.pl/upload/file/24347697720.pdfIn PDF document text
    • http://yilip.net/userData/board/file/72060388435.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/pixumixuki.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/selavizonomezapop.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/d16f5v117b0fki13ocmfoiletk/54828203371.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969592915c7---20382112480.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/8285832098.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/knem2lvl4o203ulqv99qh1vove/536987956.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b081391fc15---pubikiwevupuvafobanij.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b2c747d78---91858514213.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/bilabevidavid.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a8d26eabd82971812eaaa2c0290804a0/voxajik.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/xonibiponipikus.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/734d6e50d53a49088e85729cf4a114c4/luregigemufevozedorudek.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/95388717386.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/xotigowona.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a0877afa4---90959628442.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/39676761883.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/77b23994b2190141f4a817a03b2e8ad0/panilavasuvukiderefogef.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160799f2c72534---fejotuwuwutivoxoguwufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=wifi+mbps+meaningPDF 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_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 10468 bytes
SHA-256: b38c5b619065ecd01b057a1a052f4d63c3c1f06314dcf2ffccd082a43f31b7ca
font_01_sfnt_off0000f9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 16896 bytes
SHA-256: 8b0bcc2469c05827b6c2216155ad97ab208dd18aa2873a2c2f50a1907332c160
font_02_sfnt_off000125b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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