Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f67c80b17842abd…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 07:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d5ab052405fd202279507f5a2a5c11d SHA-1: 46438e02383e4945fd8c29227aa4b691337f7968 SHA-256: 6f67c80b17842abd33db2f6f22a53e17241f0576a9a8f11613f66ef029446804
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution lure. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://alpinashop.bg/files/fofefemoxedoxuluduleku.pdf In PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff6bcc36c---kitisirepatuzusabimeted.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/xevubatux.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/38189303358.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7d938d9118fcf17d8b868ab63fed6e31/50033364909.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161443b3ec3bd8---sorom.pdfIn PDF document text
    • https://ubranni.com/uploader/files/bukagolitufinatig.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/famiwatebo.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/wibodul.pdfIn PDF document text
    • http://midel.me/userfiles/file/wokupusebirewukowabomu.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/62875922593.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161444e5344e54---70040404221.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/tefamevujuw.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/jupoboxitub.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351cc06f729---sidilusalifonifanabudapo.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/bemibalefu.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/86594625412.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/kixidoxeworubaralo.pdfIn PDF document text
    • https://stopserv.ru/files/file/28464059139.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386126a83c4---poludomegokapeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=internal+memory+vs+sd+cardPDF 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_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 10572 bytes
SHA-256: 82d16a9b95ca6bfad63c4e40698cc21081e595ee31bff9d10bcea34fb4865242
font_02_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 17336 bytes
SHA-256: f72f57f8e4df9bafd834e5128a59103fa138f4c548a72862b0778dd3e8023933