Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec68df4f41aba0c8…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 20:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a3c7b7c0a75e602cde88b5c2444aab9e SHA-1: 503b63027d0feb5dce1593e7b42f345888795f42 SHA-256: ec68df4f41aba0c84bee045d69b010b5af06398c64b505b4d0f1c35098ca7e4c
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is identified as a phishing lure using an image-based deception. It hosts a link farm pointing to numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://krisoc.ru/uplcv?utm_term=how+to+record+cod+mobile+gameplay+on+android PDF link annotation
    • https://profix.fr/ckfinder/userfiles/files/gititova.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/kifomoludegumo.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/6465248694.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210910171922_l10496.pdfIn PDF document text
    • https://mashura.co/userfiles/files/koradive.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/12256177254.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/97448795333.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/bubatipemero.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/2870886028.pdfIn PDF document text
    • https://cityface.cz/res/file/66296312069.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/65879108771.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1fe77c2709e4ab6deeebdbbaec4726b7/46834020440.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/jememilajebusivekokopaxiz.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/bezevetupibukada.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/paguraliw.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a3c4231d4---tapigobovesidun.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/26706214459.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/serul.pdfIn PDF document text
    • http://plise.org/userfiles/file/55660191726.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134be8197ded---92451891312.pdfIn PDF document text
    • http://apex-architect.ru/images/file/gelobivewijelazo.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/44903760775.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/bodit.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_off0000b036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB036 11020 bytes
SHA-256: eb9b8a70b1fa7d66f0aade9fe0dda0eae972fb5751100b1d1556dc5e9d048675
font_01_sfnt_off0000c963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC963 13844 bytes
SHA-256: 9838fd69541e563b366a879303b217bfcf78feff0c6b4cf22936a15cf49681a0
font_02_sfnt_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.