Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafe0e59c6cd5498…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 12:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4e9d7b3d67aaeceb6fd5240de3b5b914 SHA-1: ee1b7b334cd97ceb492ee3a2d74af80d70e639c2 SHA-256: aafe0e59c6cd5498108b9164b599cc37fde96f8abef9e9c5567ced53ffeff903
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with multiple embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of numerous external URIs and link farm indicators suggests an attempt to redirect users to malicious content, likely phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=wrestling+revolution+3d+pro+apk PDF link annotation
    • http://antwerp-reefer-tournament.be/argt/files/5153493220.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/kubitoxiju.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/90963477402.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/16520662844.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/18135387124.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161344f2231432---48816704834.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/b1gm7c9ugb45rvojpdtr9rgck4/29059323425.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614144e04f43c---nuwivunori.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/dimunexisororijegariwifar.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021092122285670554.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/dorowi.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/87489949076.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/43659503498.pdfIn PDF document text
    • http://computerdoki.hu/user/file/vovokerukepaxiwugusosej.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/64cjgd696samd72vsgtk70ml20/vugefarujabal.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/66397350947.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/60863534326.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/vamib.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/lezonosit.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/xoduf.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/fosakalojakixadatilokok.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/doxisuvatape.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/29040744867.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d31579d283d6ed59544587dd24210b64/jowajatafudoxubuwu.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_off0000b053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86A 10988 bytes
SHA-256: aca3d0d4eb7c88a54efc2f7afd07e4a9d6bcf600d2c49e23a0baca43c773a4df
font_02_sfnt_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 16284 bytes
SHA-256: 84834c4f3fea24b88665637070fd216b685c60aca259e1e0bb7e06f0e7da0780