Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec75afeef1760ef…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 12:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4dbd7bca896a96670a1908925ee6123a SHA-1: ccaa5a30ef382b9395991e83a045276d7a331bc3 SHA-256: cec75afeef1760efb0a841eb0a6171f023d94aa7d727efb6fc0de4a3b88b716c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The presence of external URI links and link farm heuristics supports the conclusion that this document is intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=cast+from+die+hard PDF link annotation
    • http://ombs.ru/uploads/files/83798355012.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/41004764578.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/63921802187.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/496e179eccdabfe28b9e4b04a4c5780b/lilix.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/13395489398.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4dd845f35f1088527648752969000b1/jajexetafak.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/jutulo.pdfIn PDF document text
    • https://fivetc.net/uploads/files/mukubupegap.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/ravawanoxejobotatuvufu.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mudejitakebepapixu.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/73823475411.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/66117526994.pdfIn PDF document text
    • http://wsm.hk/images/files/21013917746.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e2fecc1a0c25f4b4ffd7f37eb0445507/lovuzigobi.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/miludotuxogudef.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/vamub.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/80913420454.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/pinonorumonopowal.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/76328677035.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/pinogomugelalebum.pdfIn PDF document text
    • http://dges.in/userfiles/file/xoxedagi.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1630627008c7e1a8315717a9cdd8fd.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/borubuzixokidiwasudopufo.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_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 10500 bytes
SHA-256: 30608a04118e72f28b1cb0b497c878f254b25a46dcd0bd985425297f684a5a95
font_01_sfnt_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 18816 bytes
SHA-256: eca2a4b6392335586fff232356b0adf8af76f4cc5454b265eb4f049a5fc97ca3
font_02_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1