Malicious PDF — malware analysis report

Static analysis result for SHA-256 867ab5357ece1a28…

MALICIOUS

PDF

85.2 KB Created: 2021-06-30 06:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2c1b6680582583350811a747b035b28e SHA-1: 6cf798cc1df70b8f1c43061a797779e78178cda5 SHA-256: 867ab5357ece1a28df74347a35516571ee478daf3506c559cd22a6bfd9707331
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Multiple heuristics identified it as a link farm pointing to compromised websites, likely to host malicious content or facilitate phishing. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f7cb743e---80821926167.pdf In PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/rarulivezexereko.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160837f743bfc3---zotejexajufatas.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/12344313907.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/nafonujatanuse.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/rmh99o4oa9og0n5boa1somv57p/tuwolifijejadoxiwezilumiw.pdfIn PDF document text
    • http://yejida.com/userfiles/file/29707140568.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/6n6bqsqp8q29gq1qnbt61hvmib/nomox.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/22264981483.pdfIn PDF document text
    • http://cutskytools.com/d/files/letugo.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b89a2da25a010b7c574eebf2a1911ba2/tadatalutesaxigodujo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/cb3382ea09b24c502801ccca9013d50c/fesaxomuraxolufuji.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/tevikufivesuwarakekek.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf75fb0b62---48378645722.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0be3daf313---7468528543.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/wawifekavulus.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093a4c68900e---18755578918.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/79602450228.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949d03b5740---kefadurixasagufukazex.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/ledoxuxabipi.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20216281551317555.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/vff8kd4qrbgf2fftrqrgur6h48/fojunuzira.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc1e2377cf---jatalede.pdfIn PDF document text
    • http://bociany.sk/media/file/mijomerowodev.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/2858c249b9adf96a0c1ee1899c0b982c/23436672696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=very+delicious+in+spanishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 18016 bytes
SHA-256: 45771de8271c09e5c0245a11fca8a4fbdae8ec35443e6a7e4044711eb9e2eea3
font_01_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 16488 bytes
SHA-256: d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742
font_02_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC4 10696 bytes
SHA-256: 680f87b570b6e142f2562d1370eff435c58d4b5755fb4249b0e4385738a2347c