Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa17d937d4432d8e…

MALICIOUS

PDF

87.0 KB Created: 2021-08-31 01:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9d638dd09e487183d247603892d5825 SHA-1: 983e577f7cce4ad8f70c71fa8ac6720189eb3d50 SHA-256: aa17d937d4432d8e8674584a7136dd8f2d7085965783b3119950864f0daaf979
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, many of which point to compromised WordPress upload directories or other potentially untrusted hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5211b10ca---45400839574.pdf In PDF document text
    • http://fornacedelia.it/userfiles/files/judomebere.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/5715450232.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/61548198925.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160814308d85d3---69469511608.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/kotugikomatulimutupakis.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/piwoperafunawuduseta.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/sabogedudinugeli.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/bonenesed.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e3d745c26926d43fe65896f318b6fdcf/75975734702.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/7e367e39104176a495d9d46990ad148f/bozosivudavikejiju.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/epoovj5kqkeptiqe5a4hkm9vv5/14350959196.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160755ff93714f---vemeputi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2e2964ba---35119530292.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/lebanomizi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/63624354910.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac2a8b3853---89337839902.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/85619751294.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/vcu8d3dim7uu7euesflmi8hn95/zesulefake.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/30418226021.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/zukesiduto.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9508df34---63450386087.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160758769c94bc---mozamikesu.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/21663669905.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/87824928644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=blue+acara+with+angelfishPDF 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_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001082f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082F 10732 bytes
SHA-256: 7a4fb2fd747d410ecc53a91dfaf869d3016e6f89377893de7a792f5a08239b4f
font_02_sfnt_off000120dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 17532 bytes
SHA-256: b5960f41779f44f1d63940e01684397080b60c5010ac38a11094976c8585540b