Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e699f026ec4442…

MALICIOUS

PDF

87.1 KB Created: 2021-09-13 12:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d6f86bbfbf6f894921759836957ca34 SHA-1: 4c02a8a719b625948a568867f595048c1b8b1c56 SHA-256: 23e699f026ec4442ce7a298642b246cc67f812d73204800c880aca7f322af5ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm and being potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, particularly those hosted on compromised CMS uploads and disposable hosting, suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.saletime.gr/admin/fckfiles/file/32129851895.pdf In PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/37300999127.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379cac0a472---zudulejakuzemikijaw.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/69555814538.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/7328755280.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/muxedixunigabit.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/birafedojulegefoxarewoja.pdfIn PDF document text
    • https://begili.com/uploads/image/files/4482753992.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/88305303788.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/xobotapuseki.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/18140664533.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6bf7d45f3---kejewatotipobeperabulev.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/vafuvak.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/62544328609.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1f068c577---nenigexaluvetowoduluzeja.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/44963078064.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/22126010904.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/vevoninug.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/jaseba.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/71097365333.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396ecc552d6---10761962812.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/63010074552.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/30829536250.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c64d416f8a---gokegonulevugeja.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/tofabudurodidesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=open+office+for+androidPDF 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_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 17420 bytes
SHA-256: a077a8741e0886e4c89642e40e7b7aa67b45cae23ef94c97955685e521bc39ae
font_01_sfnt_off00011f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001375b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375B 10324 bytes
SHA-256: 6bf3b1a0314f3844a1c3fd947d7c6e4bcb6618e2bfebcc853902dc6a8246b8eb