Malicious PDF — malware analysis report

Static analysis result for SHA-256 a279f69722547d1e…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 11:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fced7ec61edd33915621edbf81865588 SHA-1: cfb0d71965ea6e0459f11116d3948c242e60c3ae SHA-256: a279f69722547d1e00d3ce2bab927a038142e3b6af80f7e7bde074054867a99e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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 http://aktifbant.com/resimler/files/tijogojixiranomazirowud.pdf
    • http://iphysiology.ru/upload/34189959421.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/46953e6586ece127433bed253304d9fb/76218825160.pdf
    • http://polyacer-ecp.com/userfiles/files/20210921_110848.pdf
    • http://xy-interior.com/uploads/files/202109230330376610.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614643fad8cd7---jojilalulavokagozexogiso.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9a67df555f47dc2cb4d5dfdc64cac32/32519406844.pdf
    • http://thuocamakong.net/userfiles/image/file/60190387712.pdf
    • http://www.yemany.com/yemfiles/files/49349291221.pdf
    • http://eca.or.th/ckfinder/userfiles/files/1421348098.pdf
    • http://creatinglifeoptions.com/userfiles/files/95574733035.pdf
    • http://paulabenveniste.com/UserFiles/file/38995790965.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/91a2ad927ab896095136749cb6e7e630/93087890215.pdf
    • https://khonggiansangtao.com/platformecom/img/upload/file/2825146155.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/buzud.pdf
    • http://szm.hu/userfiles/file/1469491215.pdf
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/15216839212.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac94432a85---kakifuwivibijoz.pdf
    • https://rhodium.vn/uploads/news_file/10728061426.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161319fba3fa83---sasoboxijupotibewi.pdf
    • http://cecev.com/stockages/files/lofosoloz.pdf
    • https://digbijoynath.in/uploads/userfiles/files/34502687648.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+restore+saved+passwords+on+iphone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b138.bin
a1277e81407138de76d9a07c829b77be5627e13f3a544f67d2ac711fffb2e6b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB138 15168 bytes
font_01_sfnt_off0000d787.bin
0eb636267dc222818898279d9ff3e98af822671e3f75556182dc5d016ca71368
pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 10588 bytes
font_02_sfnt_off0000efad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 16792 bytes