Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8628a470864abb3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 08:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da39f7180106c743fc07dd798d27e9f7 SHA-1: dc1dfb562da50164a9ebeb7d63fef45946a30bb4 SHA-256: c8628a470864abb3f7e89bcfefe3ae5d7f43bad9ee704c26f1d5aff3a9c8eb18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external links, including those hosted on compromised WordPress sites, strongly indicates a phishing or malicious redirection campaign. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://marketingnews.fr/images/file/govudeferavip.pdf In PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a8d062f9aaab6b7cf962e14664fca450/bimevanejalikodo.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/9873458577.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/97014388199.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/lezoku.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/tamolizujejitipetitev.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/wenaduranines.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea87d0101f---5695863810.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/93741004144.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/91731801979.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/98892265766.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa9fa0d777---fixejetuletujegojupew.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d55d510fdf---revagazubemaxezagem.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/22310950814.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/47938936603.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/bigokudajakoxuwonij.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/wosikos.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/85497364453.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e342fb54b84e47e572f13f9a8ffa8981/xojutejafogiko.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/padasakaxejed.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/dupobetox.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/31793140394.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/pulifadetamidaluvezukixa.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/miwadarusebevisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=minecraft+1.17+archak+gamingPDF 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_off0000d6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 17516 bytes
SHA-256: f52d665fd99ba7b64206ce54a157a60788e56e9d4d892c5407245492f4bf2d18
font_01_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFE 10704 bytes
SHA-256: 5a1f3cc4b8c754773c458d39c7af86df937394a701fa44b9cd627342b7e38e9f

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