Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c710c144f59072…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 17:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3498c96ae752a13a0b71413d5a31eb8 SHA-1: 71acb2bbf8739ace03b012286d73c345cdc2cd81 SHA-256: a7c710c144f5907257d7e7fffd9634f0f7bf40c87ad8a1ccdcd80382bfee2d28
144 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating an attempt to deliver a malicious payload. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly suggests the document's purpose is to trick users into downloading further malicious content by posing as a prize or delivery notification. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://archism.ru/uplcv?utm_term=dh+texas+poker+apk+download PDF link annotation
    • http://www.sun-green.eu/ckfinder/userfiles/files/jarona.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/42c8335aa508efcbaa319afa263ef829/82302278550.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/41412112076.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/bevinajinenufitalij.pdfIn PDF document text
    • http://ubest.ru/images/file/60744954361.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/darebesuduru.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/likosufokupemovorup.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/vk1mg49tj7ppnnh3ovijquh2b7/fufadonetivuxiliga.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/bobexuwadovaj.pdfIn PDF document text
    • http://devveb.net/userfiles/file/26742429177.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/sixalarinotomixirixukuf.pdfIn PDF document text
    • http://cascad-trans.ru/files/rodidub.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/vidibofakukejaxuvenezex.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/kedusojuvu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614479658a886---vaniluzipapidagumaju.pdfIn PDF document text
    • https://emenu.hu/editor_up/16422923936.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/99a1141ad92cfd73d98efc113a066c7a/tikikogevovanuxerakaxe.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/98303520155.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/92276000958.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/18500040531.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_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 18600 bytes
SHA-256: 79dde733cb5f7e8983a5ea2ff1ec8aec33cd688279a177b902e29830879b9c5d
font_01_sfnt_off00010b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 10676 bytes
SHA-256: de29da9bf82d9bd0ff92daf9f7ce4b1288c09f76c067148402464a0acd448bce
font_02_sfnt_off000123cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1