Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa471aaaf588724…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 07:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2adc81acc1ae4714fd4bd259e5171061 SHA-1: fd9ec1bf14905d32c6ec69d0e0331f42f57b02d5 SHA-256: 9aa471aaaf58872452c575fb71b606ebddedf221565cea60e6ce837b9b8dd7a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, with several identified as compromised WordPress uploads, suggesting an attempt to distribute or host malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://scpt.it/userfiles/files/wukekoxonagevo.pdf In PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be3ba95c9e9---futopikuben.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/kns0fqu0jflrdvicee53849fcl/gaxasamapuvokikubijigunez.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081145c41395---24960183254.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/38712674766.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/2409218180.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086bb747897b---turozixumumulepujebik.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16076fae26aeef---94936984681.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/fvdbvm4j8u4tleic9s6d6l8907/dosetezitotapuzubevi.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/30194221634.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/sobakuzumura.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6ee334b61a138fe98dc97a3f6a1f2e20/91187531931.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210617224214.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/92535795807.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/70570749769.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d423e8edb7e5af899b792edcfe39d076/12285070141.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/atr41k2dhugl64ivvtfgmebad1/fipodutofarid.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/sapizeluxes.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8526862fb---wovumemipikazivutiluzi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8cdf60554---29476974822.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b1f67078a---92570120964.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/xamulusanuji.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/xubufulowixikas.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160819eb471c36---fovumuv.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/gevaxatarawulubixaxuluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=convert+photo+to+pdf+app+iosPDF 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_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 10648 bytes
SHA-256: 209bb88e7a1d94211a8e72fc6d82f7929070e714b6102ed979af3954b10be7cb
font_01_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0D 17668 bytes
SHA-256: 1f64df7bf0f4eb75324de90b05fa342a13297c1ccb02c3051bc968eb5718d0c3