Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ec9e1c80e77aa7…

MALICIOUS

PDF

76.3 KB Created: 2021-09-11 05:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 346601d8930140bb9888f37cbbbc622d SHA-1: c528a3127b3609a26df36f969a5f1ac6b0dec996 SHA-256: d4ec9e1c80e77aa7cdb757e6b0bcc5815d3535f7386401ff1a727b66081e5aa0
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or malware delivery through these links. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=naruto+storm+4+mugen+apk PDF link annotation
    • http://usateatop.com/_upload/files/jisuze.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382c5d740cd---2935224296.pdfIn PDF document text
    • https://egf.tw/test2/images/file/61363922309.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/72666553662.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/78725176978.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/84618833742.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/71728144205.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/voxosamobu.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/japekonexilelewesixa.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130e95cd5ac2---wesosafazomobaduz.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/pidavesebivigedevevat.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/mokiwisedufugu.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/54416598949.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/45579299120.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/naxisesenevakofad.pdfIn PDF document text
    • https://aromamarketing.md/img/files/92722461348.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/romotabetekud.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/69892999918.pdfIn PDF document text
    • http://abwrva.com/uploads/files/giratoju.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/jinutabimuxivalowofudep.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2fb456c3b---38788775898.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/lujusukaj.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/fejulevevepuxikip.pdfIn PDF document text
    • https://majubesar.org/contents/files/87658457523.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_off0000c6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F5 17032 bytes
SHA-256: 9a7853527837f9e87af29d9a28c4eadab2d023f624737457f0a80d56815c916b
font_01_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 10704 bytes
SHA-256: faf188e8ee20dce6f31a2e3bd86f54200af7b213f84b0534d24348cccf61cd0d
font_02_sfnt_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1