Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3df1acff1a4e90e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 11:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef4117a77cb435a1024e761f7782977f SHA-1: e10038cad8a9f60d2ab1599b9e60030ed9b0c70b SHA-256: a3df1acff1a4e90e4d94709d28eb04397b6ea4437c93543338f92e2d1a8ec676
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and numerous links pointing to potentially compromised CMS uploads and disposable hosting, indicating an attempt to deliver a second-stage payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The primary attack vector appears to be a malicious attachment, with the embedded JavaScript likely facilitating the download and execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://lidiyageorgieva.com/ckfinder/userfiles/files/58711334366.pdf In PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613962baef0fc---41916992830.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a159e2360f---56487396735.pdfIn PDF document text
    • http://lscapital.it/images/file/rujisozinabopamelu.pdfIn PDF document text
    • http://sung1.com/upload/files/gijovexetago.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/sodugojejitozopife.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f57c89919c43cc5db10e1b6320435172/13489322463.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/82850895409.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/19227311581.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/nurenalevavifadu.pdfIn PDF document text
    • http://ipublicity.cz/data/file/55017130197.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/bisomamupiwuxolekivadebo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138b48380dbc---87149826606.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/rilajemix.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/81985361378.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/193050ebbe3df730b7291dd5b85b1fa3/48400067676.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/vifofojixovizis.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/18149579529.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/sogavedazusox.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/53649364210.pdfIn PDF document text
    • https://hse.tw/upload/file/tugenag.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091022112947.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/daguriduxosuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=best+runner+games+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_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 10696 bytes
SHA-256: faf90336b7da53e6d0f820fb433c1b6f573891769e5de99b87a37542678e337d
font_02_sfnt_off00011341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11341 17244 bytes
SHA-256: d768c766e790f47649ae23e3081343479bce117f748b4697ec630d5183e0e3f9

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