Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a3fd1afd62fdf3…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 13:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29f25ea3dbd7c70c57ef3db4c41976c7 SHA-1: e0cece4c74f23ca9a17a1a40fef339978f5b37f0 SHA-256: 03a3fd1afd62fdf32b8ba20b22c903c14850e2b7a651a38f958c1189a1df5a18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to websites hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be directing users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=pdfbox+convert+pdf+to+image+java PDF link annotation
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/91596508388.pdfIn PDF document text
    • http://vieclamtaichinh68.com/upload/files/dufukabosolubujurigun.pdfIn PDF document text
    • http://limoride.net/gallery/file/43191428227.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d453d114b---mopinupewuxeg.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/15192382839.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/dadibolinitivoz.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/wodanedodujojafapufatana.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/26079f49b729d63ba35211447b4f20f7/65514017493.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/jivoreduvaromidenoluwelax.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/90355014113.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/samivewiguxe.pdfIn PDF document text
    • https://anup.bo/images/files/donexupananojebuxuvop.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/a88e00bee32349b9a5d962bca62474c5/puxamowulewov.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/jetokavifobuvixiza.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rumudufobevomakefopuxit.pdfIn PDF document text
    • https://epiphanych.com/images/file/rowavimudubakezuvomo.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/34838788310.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/74848035654.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef431e97b---ximelave.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa298955dc6---xovoziwinafexuzepeker.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/62908632767.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/15467254387.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084c722472e9---49158272002.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/tosivopovapulinunisuvovos.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_off0000cbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDD 11188 bytes
SHA-256: bbb677caaa230c5d10819e1112ca8e5c5517d852ac17138823d457f050874f91
font_01_sfnt_off0000e5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 17728 bytes
SHA-256: 40f288d8a8e46fef8f72708f6b449f76a0940fe46e8fcfbe36684260c5a35964

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