Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff52ead81d13b761…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 06:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: accb71535603fb53fed9df7965192c42 SHA-1: 57871ddd6720c3c5aa326be30c7ebf75b981fee9 SHA-256: ff52ead81d13b76130441bed0da8bd6f3661befd154bf32d13baa1c4e39697af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or are part of link farms hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs to redirect users, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://huntic.ru/uplcv?utm_term=open+inspector+chrome+mac PDF link annotation
    • http://www.gdchgs.com/admin/img/files/20768535280.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/30597921127.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/41310041661.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/fubilevewilububawowuduz.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/75756088973.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614679dadbc5d---latasexuxeravikevikenu.pdfIn PDF document text
    • https://actor-conseil.com/files/file/tupiluzukatobem.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/98998716725.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210907_CF68FE02504CC529.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/5abe59aa7a20588977a1cdcf7cc99e13/99494334219.pdfIn PDF document text
    • https://linker.tw/files/5026907168.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/93681154188.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/37253493766.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/78866475104.pdfIn PDF document text
    • http://lgassociates.in/uploads/34789015171.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/donoteweniziva.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/suzexovogukop.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/59070478946.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16146636f388fb---54133704082.pdfIn PDF document text
    • https://renault-service.com/userfiles/96770705923.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ir2u3j801aa688v1etfoicql28/63702970376.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/15259104780.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/61074805448.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/gogokuzugilovalutojox.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/jopix.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/c89ded92ccde6a2e5c14ab04737ce263/jofotazoliresafagi.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/43020518462.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_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 18140 bytes
SHA-256: 5347f577264a39198775ca5b90aef286cfa5bc684fb35717f96773b939b3035d
font_02_sfnt_off0001279b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 10616 bytes
SHA-256: 60eafcbbb61b17c6ecd62bc838f587a0d2be4ab7207364f97d4c2bc6f48da183

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