Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0bf224ae9125a2…

MALICIOUS

PDF

78.5 KB Created: 2021-09-08 20:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 58ea74c671ce24b6d6c7f9be14d10607 SHA-1: d9d387b9960a37e228b8ef3dec78ff1378ae678b SHA-256: ff0bf224ae9125a20f4d3a0c10e157bc20eeb488ec4999acc1f9af47e7e41c55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://tierlistei.ch/downloads/wakezegaki.pdf In PDF document text
    • http://bluecars.pl/userfiles/file/9677803747.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/vetesedobodejetomaxuz.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/wikejado.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ltv82i684the47vq6o4j3boa6b/84143907451.pdfIn PDF document text
    • http://koddous.com/userfiles/file/pokamiguvezapipidowem.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/putugox.pdfIn PDF document text
    • https://hirurgija.me/files/zizukebinekipomoxosex.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109020331178557.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f725d8d0---3246365517.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b9d11f934---66891559150.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/65883057158.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210904_150120.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/42888155852.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/18998133567.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/4k0k0eqqhcjkp4q9e84roa2s8o/97098192768.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/pavufiwumowof.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/95328566943.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/28242746293.pdfIn PDF document text
    • https://subded.org/userfiles/file/tenud.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/79636051415.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/wajazojimewo.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/12712859699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=carmine+gallo+talk+like+ted+pdfPDF link annotation
    • 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_off0000cc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 18048 bytes
SHA-256: 7a9019f2e035a1111eacbe2ee5b5c96476bcc35f7215b7fd28d6cb67f2064b28
font_01_sfnt_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 10796 bytes
SHA-256: 1a5d5421a8667e4c7fc61705959901c79e0fa7b6a9f74d32ac9437771860f6e6