Malicious PDF — malware analysis report

Static analysis result for SHA-256 a779ef1e1e3fb44a…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 01:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f13806fe35d2d852bbacf41bc213d85 SHA-1: f44052d56fb666bd4d4a36f81b597244f6c2d7e5 SHA-256: a779ef1e1e3fb44a1366a7b1985ad9dcf35235f36444a595fc2fc6ee42c0142f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://archism.ru/uplcv?utm_term=life+movie+2017+stream PDF link annotation
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/kipipazixorenaxewezajugar.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/moxaniwadikikizu.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/25436747721.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/mibijul.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/13817908936.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/580110d4ba496ab9a50c14c739869f74/77072076611.pdfIn PDF document text
    • http://emannsltd.com/userfiles/57492440120.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/tifefipagikadirinunu.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/tanogonejixa.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/jufuko.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/wepimapopamafek.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/5420156661.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/dajopir.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136af6391fe2---69269047742.pdfIn PDF document text
    • http://www.moyekolodin.com/files/57759717740.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/xejulakuxof.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/85601350607.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/wasozigovi.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5ks0t11r7jr402shrbpurtc8q8/diwavobusaj.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/25353872933.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/35qj33norkcetrl3qaa3d4kvm5/33130084839.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/gimifaloguvila.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/65174612693.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/49848361674.pdfIn PDF document text
    • 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_off0000b3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DE 10592 bytes
SHA-256: 84dc4cdf18a7e21ac7a1beed8176abdd77bed9511a820351b9eec723cefa64b5
font_01_sfnt_off0000cc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC47 16612 bytes
SHA-256: 64d77f4c8beb7817dba1a82e859249e843166397b42205da11cd4a298b4ade14
font_02_sfnt_off0000f66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1