Malicious PDF — malware analysis report

Static analysis result for SHA-256 96af70786ca1a47f…

MALICIOUS

PDF

74.3 KB Created: 2021-09-15 17:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 64ec63e9808152c5310dd37d7b977947 SHA-1: cc2492119a1e5c897ccb5dac311157952ad06c34 SHA-256: 96af70786ca1a47f53a9760c53043bb97c2ce09daca7f70cffcd88c6d754b2e2
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites and disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://suacuacuontoanphat.com/upload/files/99976603824.pdf In PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/rosimomigowezovef.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/95193393244.pdfIn PDF document text
    • http://ihdbd.org/upload/files/jifovopubakos.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/duvixazejukipoku.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/25128553239.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130841688b36---xiwugowefe.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/2700493175.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161418c9c29cb7---29956083875.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3f794b0eb7baa88cb36b14179f82a507/sazoruda.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/fujijinuwikovuladif.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/a1h7fdu3fojjpnmren72jq190g/48970852335.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/65101206969.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130c52a41023---76012706932.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/2335463418.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/7576026968.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/masaropexugutilemapuja.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/ruxetopenerejefonoral.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/80927957122.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/4888227670.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/falekilavepajekaleb.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614086bdd4417---poxosibavekijavenawidufog.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612edcf7e6048---46550931308.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/41721564654.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/6a1068e3477f2d9289eff5892cfbffea/begalivesunixumuvibobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=picture+from+video+androidPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/55693272429.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_off0000c24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24E 10592 bytes
SHA-256: 1d60214deeebaf011919ad029a9b36aef7859db6acc8143d4c4614d308bd31a7
font_01_sfnt_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 16028 bytes
SHA-256: 9b9f63561f54db7647c0bd8777fd9d76bc8858870fc3db73c93c2c701a922da0
font_02_sfnt_off0001037a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1