Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb9b1a354e3e653…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 14:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 611a9ef0a3f3a759f1fbf3857b155e5a SHA-1: cde7e10e2a29061a4e91a0768bbb7e2521218d8e SHA-256: 3eb9b1a354e3e6536348c29a296d8dcd3978b2f0e98d1b067a5bf0dcff5aeaee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://studiopignotti.it/userfiles/files/43678209932.pdf In PDF document text
    • https://petrovsky14.ru/docs/files/32145852057.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/fekesodulazuguti.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/3183861139.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/57700714915.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/bowuxul.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hucja1a9bld5vdilfjqta9qmb5/fewurunasewolomev.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/93489332505.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/92162394431.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/futevakelunesi.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/68398045088.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/vesipupemasimafiwesogivur.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f647392252---50343884437.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631248460_842496a5c4.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/6175150879.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/99995449528.pdfIn PDF document text
    • http://artio.pl/files/files/48399271225.pdfIn PDF document text
    • http://contextuae.com/resimler/files/19071509336.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/28341560081.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/dikimogazorasaj.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348ad762932---95461203895.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a642f922ea---maxuvamotatatuwuruwekapa.pdfIn PDF document text
    • http://gist.adrianlechowicz.pl/userfiles/file/vedusanivezisalafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=lego+worlds+android+apkPDF 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_off0000d068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD068 19536 bytes
SHA-256: 44d71142537bff640c15e053b449fb2d3e2fa459c6b2babefeb6efcdf663ee19
font_01_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 10604 bytes
SHA-256: 838e92aad778841dbff81b94bed554ac843810b107c6f6e1a5d9035b8f43f197
font_02_sfnt_off00011b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1