Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0406327e9c34408…

MALICIOUS

PDF

74.1 KB Created: 2021-09-07 07:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 91b4441d909a3bdde538c0157783e9d2 SHA-1: c857b9cd78023603a030f5ab3da2ab8aeb4e4eec SHA-256: b0406327e9c3440887ae9043c9dd41a1ac3698d98d523759b91482a761dea691
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://benly-carson.com/product/files/78132329141.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/46062600779.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/xujapiliwiduzalasedevo.pdfIn PDF document text
    • http://www.pilartangguh.com/file/8075363844.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e631506499---58884452857.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087febd0b2b6---rafolegipuxeza.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/xawujo.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/997318166611509e2299c1.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/xelexepatijekizarejax.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dce44215139---vikotusopos.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea0af9d3fa---22660367048.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gebimemijereposesuk.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/1610767178.pdfIn PDF document text
    • https://koreayokogawa.com/ckfinder/userfiles/files/86786212428.pdfIn PDF document text
    • https://plasy.com/uploads/file/liligozewi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7729ff02e4---xidafizatuz.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/90653784417.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/fumowirekegerikitu.pdfIn PDF document text
    • https://maria-galland.ru/files/file/sotiwibereleju.pdfIn PDF document text
    • https://ocw.tw/uploads/files/nopevikolimimino.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/96517263196.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/zarebederabunukaxesab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hymenolepis+nana+tratamiento+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_off0000bc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2D 10764 bytes
SHA-256: f68c1ab19cda7f353d3d2993189ec3e5c53374be5bd1c6695573932830f8f946
font_01_sfnt_off0000d4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DC 18320 bytes
SHA-256: e8a34054e2cc17a0597fda1651e5bf0c9a0bfeab5dc3b4ae9259b63c4292f2b6
font_02_sfnt_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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