Malicious PDF — malware analysis report

Static analysis result for SHA-256 0855a3d270262f83…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 05:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 039737fd61d958cc01a95f7198ed4c8f SHA-1: 33464b3e965125a524ad4c77b081fd033ef9a72a SHA-256: 0855a3d270262f83d856aef664bb0e4db66202873bfaa2449e8238d229326735
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 URLs, many hosted on compromised CMS uploads and disposable domains, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification confirm its malicious nature. The document body is heavily obfuscated and does not provide direct clues to the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f219068118---tezinukedaxuwerurawazov.pdf In PDF document text
    • http://www.luna1956.com/images/library/File/69326213998.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/fifarafipan.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/83637158249.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/57595672370.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/sovukaxinufevumi.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ea4714b9992a45d55e17c818c2ed1513/vaxilitifewifeguvesa.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/xuwip.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/razupuxodewufujufopime.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/97694352779.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/paveti.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc09acce1b---32548395322.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/guwafabogex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613264caec1e7---givuzimapofibiral.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/maxemep.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614085c9e7096---44938537188.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/tetanixalapibuju.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/kebifezurefetitikutujovev.pdfIn PDF document text
    • http://toroisg.com/public/images/files/datuzevomudop.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614452412d7d7---36568239459.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/48688338252.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/94427359525.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6a02400e7---91985600073.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/6019286866.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/94411512524.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/570f403c2f245f1d5615185f0c304f12/gazulewodino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=top+10+free+games+for+androidPDF 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_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 17632 bytes
SHA-256: 41286c7ce34bf2930e4c4b80b43803bf000b03f8be2b8f5501e4b5ee9e7b5c2a
font_02_sfnt_off00012f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8A 10832 bytes
SHA-256: e870ffc5f852f8a6f2889c86363654efa5f17d193819cbaa24800a4775b8b175

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