Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6979cf1073775ba…

MALICIOUS

PDF

101.2 KB Created: 2021-08-15 17:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64967f31961ff996624baa81e89fb057 SHA-1: 18d010a9302b3e15738455a2279081b67553388a SHA-256: d6979cf1073775bade7b40a8a5cfd9d9b92aa174e242c03d36276c6c84be81c6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URLs point to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://raegcafe.com/uploads/files/kadoxosude.pdf In PDF document text
    • http://premo.at/userfiles/file/5403934414.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072221066cf9---sukinumer.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aba0165adab---sedidirimimejivelezilemus.pdfIn PDF document text
    • http://planbmedia.hu/files/pudibizifimagelotuza.pdfIn PDF document text
    • http://xn--42c1dhzaq5aeb.com/userfiles/files/najisaboviwamezi.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160932150658b5---pasat.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/71302764526.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/fa65546bd149775e028beda6649f07e0/lobuwaja.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/38b04df74351a669f21c4a5d4ea72305/bojuwofesosizirejizanuk.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/88r6b9h2sjq5eit49f0cs5c9ib/28725012498.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f92ae3aaa---63218644875.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6e7ddc48---19140016838.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d6117224d0647c8eded53e1f71ce3723/3414580041.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/lonidaxavulobikat.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609e27468e5b2---8737999740.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/66b89e8b1f710305eb242ce0cd039d90/37065801669.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/npt61n0je1g82hg4ih64lnhiu7/41244529358.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/vanimudatizoxax.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/bagomadedulozafadogelawug.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/36832897324.pdfIn PDF document text
    • https://hsse.cl/files/49118362948.pdfIn PDF document text
    • http://synergyproperty.com/images/files/sidaxewamawadobumupozavur.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/guragexibirelasopotuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=desarrollo+del+pensamiento+logico+matematico+en+preescolarPDF 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_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 17692 bytes
SHA-256: 4ce8407b89592687870b323f8006ac281cae3eb5a744b459a9094168086a6d9c
font_01_sfnt_off000153a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A9 10856 bytes
SHA-256: 0db99b49108ea546df2ada74cc0546e2deef1d06de66a56cdf59be14463d5370
font_02_sfnt_off00016c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1