Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82ddfa3e73c55d1…

MALICIOUS

PDF

85.5 KB Created: 2021-09-06 23:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9ffa65cd2964a12c63e995090e55e40f SHA-1: ed8b613ff3f50dba45122c77bb7c4a487f9f1019 SHA-256: a82ddfa3e73c55d1fb6274b62357bf3471bdf11c749e0354b1abdca335163232
172 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. It also features a visual download button and numerous links to compromised websites, suggesting a phishing or social engineering lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to exploit vulnerabilities or trick the user into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=ielts+recent+actual+reading+test+pdf PDF link annotation
    • http://tantex.org/tantex/tantexuserfiles/file/18437335805.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161237c24196e1---55099071828.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/98965072539.pdfIn PDF document text
    • https://bak.vn/upload/files/6169424488.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7360eccc0bf9c07a76295d19b4a3f012/46935832631.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tloubc0po8iq7fbpq2utted1j5/2001206225.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/46256607145.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/24597422068.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c3sf5ru1ql5os1snrbv9nushu2/napenopopopiv.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/rijisemotokategopifusim.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/42621412247.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/19110851245.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/699852e57569118d1e119acbb6b609ac/69026601883.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095d38e790fd---lodenakasak.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/91943112410.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aed83df4f9---logena.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/vukisave.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/9401968234.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a57ff50e200---29473799575.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/gatilavajavelolemepozupo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9a6fb085e44cd23992da33997a520789/koluxelidotu.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/lusemuwolu.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_off0000e106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 10724 bytes
SHA-256: 217188cf2c34d15a73f0b32a4298ff2d48da1dcb605810d54d06d25678ea3600
font_01_sfnt_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 20844 bytes
SHA-256: e0c278be801e411c77b93d95d56cd7b25272534f9a2109869ae0faf0dd8e1f7a
font_02_sfnt_off0001304c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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