Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ebd18a4b92b31f…

MALICIOUS

PDF

74.2 KB Created: 2021-08-10 00:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2cdcf10f299157c0444f2160c3a2b68 SHA-1: e4be59e53b05e49f0b660955158ccc85dd61bda8 SHA-256: e3ebd18a4b92b31f05a43f730ae8dd9bb059612cf92f98fadbd231706fe1f2dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d174738e36---58492417354.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8feec4896f---gubozejivujuditu.pdfIn PDF document text
    • http://deauville.ru/files/file/68786378816.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/zonujivavadojalefurikiz.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/30555437211.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/77366417118.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c953231c9a---fajamivufugoxopuso.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a22fd866e71---53974750851.pdfIn PDF document text
    • https://digireg.es/upload/dewitakoweluwoto.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a86720478b---1886385163.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160985e2974d15---46296753943.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/42617776337.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/guzajupevoxudoliparo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a31c4efb3---nuvixifurajuk.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/28204895933.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/797f783dc2bb0a0f4d41d063ffd27738/gisixapekofajidokutikovik.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160763b671c8ad---tojuvunujoraluxawewone.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/fotitevid.pdfIn PDF document text
    • https://agatanorek.com/files/file/lezaloguzuwuwi.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b156c758eafd13aa01db5c5996226b56/16937726288.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/xifonefubilupomajazepivat.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/pelosomene.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/47904497479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+control+monitor+brightnessPDF 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_off0000c25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6E 15432 bytes
SHA-256: 5617f1e797d77c556907ccf70e91839293126eb36c084ef843337c9d1eef5640
font_02_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 10732 bytes
SHA-256: 5f552f292d6b4b3f018339ffd5aed083eabcde4e91e27bbd64cee596416f1703

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