Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3406d78403c6e72…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 05:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc26451e968b397d09411946a85ff1e5 SHA-1: 4c632390d885c97492c632a4f2d6fc6de9392251 SHA-256: a3406d78403c6e7276d5471770c6b0f1ec136fff34f2c58b2479959540e99c68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to other PDF files hosted on compromised websites, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=top+ds+roms PDF link annotation
    • http://vanillasky-ch.com/images/files/55551779783.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/rawot.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210903_A89967622505373C.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/148o51gj82lpk80gttfva6s864/95545026528.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf203c2c2---namisoxawuxer.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132b9ebe3e1e---50686056421.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/12275649570.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/27196852978.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/dumatorifikasowesiwiler.pdfIn PDF document text
    • https://songhong.info/userfiles/file/68106730648.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/5224153392.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/sakopefofesodisi.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/98464763240.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5f5957c1d---bezuginosagifo.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kekupadonowipiga.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/kabas.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53acaba66---77971412667.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1631327174/file/32833641617.pdfIn PDF document text
    • https://maviet.vn/upload/files/24122375538.pdfIn PDF document text
    • http://naviway.su/upload/files/liloxelebidibesub.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/51839250889.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/zilesitesatosetixo.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/76424951658.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/68275620248.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_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 9880 bytes
SHA-256: bfa13e1602f39ed6ca011057334fc232d47462659f74636fef6d8f9bde7690d7
font_02_sfnt_off00010f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F75 17816 bytes
SHA-256: ef72637b9842f400eb4bc6cd215efd246b5557c38f455aca909ab54aa499f737

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