Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba870a71eed2180…

MALICIOUS

PDF

78.7 KB Created: 2021-09-09 18:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cac7733b814c7873cd9ec6024dcc644b SHA-1: 5f23694ffaaf7384ce8c357474bc7968ea4bf91b SHA-256: dba870a71eed21808d23600f095f0c4c3b846435ca20410ea35b66d91bc8d4d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed to manipulate search results, likely to distribute malicious content. The embedded JavaScript and the nature of the URLs suggest an attempt to redirect the user to a malicious site or download a further payload, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=pride+and+prejudice+online+book+pdf PDF link annotation
    • http://pajurioverslas.lt/ckfinder/userfiles/files/vesagafamir.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/tujavawoxumasusorovosikev.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/41880808842.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/betotuw.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161337ab80bd4f---52549776322.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161389d17d303e---rutelovijifanin.pdfIn PDF document text
    • https://wasael.com/userfiles/file/18091149824.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/76921327700.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/86058252109.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/daxoxafutebasibaxonumefo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd9c614a1---vuxomivipigibuva.pdfIn PDF document text
    • https://anup.bo/images/files/68268869655.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/2259e9fced52ee174604b3f03fca2b2e/7261802730.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/50284354474.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfd154277---pekuf.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090904432780554.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/popowujidulunuvi.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/gotunaneworezowafe.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210903_075033.pdfIn PDF document text
    • http://ranch.pl/files/file/nelezesinelusujuw.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/wasadiwav.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109051112081702.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_off0000cf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 17412 bytes
SHA-256: c9885b3531e1e6e1f1b6f8ac22502c0ca008821b235ead850a2640b3eadb9f17
font_01_sfnt_off0000fc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001146a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146A 10812 bytes
SHA-256: be220f7a36eb5b8c162d5ec43e41db263cff9fd9d8f09914c20b7715189cedff

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