Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bdf1d354397aef…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 02:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83ae76a8c3458cc4a07fade1b21c07a0 SHA-1: e59972ffbd3dd73b0217c9d3d63bc7ffa268a889 SHA-256: 87bdf1d354397aef0b126e5b48cea4c097871f362822c23b1b9fb0b9524e370f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other domains, functioning as a link farm. The presence of these URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=the+little+arrow+on+iphone PDF link annotation
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/d08493208fde390701307af0ed432a53/22189686697.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/80993600722.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/dedub.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135908dca9c0---85555993007.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/28126808183.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/jejalutiso.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/95673674632.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210904032318.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/zasijapatepijaxoraned.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-11/20210911222350807974.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/44158585321.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/50347e5abe8e524741b84ce631d23d3f/92151669380.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/lakuwokovate.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/buwozamawaf.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/megiwemisadesenagi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dabc36229e117080a1fe1f03d2e24752/fopinodojad.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/91713027812.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161337fb8d503c---bipuvevuk.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/92613016534.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/84453496369.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/gisosulimebore.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210907010357.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/wenexowurimadas.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/51437624726.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/wanekufovokavutod.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_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99E 17800 bytes
SHA-256: 2a3facfa2e0b4e7ef1588585dfee4567c8513164e285c841f08db4e2db2a2d78
font_02_sfnt_off0001279e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279E 10232 bytes
SHA-256: 2373b39fcd3f039397ef4977f6c6f5a431a5f9d8807081158debf305f46ed910

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