Malicious PDF — malware analysis report

Static analysis result for SHA-256 509c98678e1dfdd9…

MALICIOUS

PDF

71.1 KB Created: 2021-09-19 18:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9dfcfc7589ceea091e6f3fe60cfecab8 SHA-1: b31061166b80feb2d0fb326564162715409f0a74 SHA-256: 509c98678e1dfdd9a29594822dd160668e9d9222d7421491a7f530c133f0908d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pumarecovery.com/userfiles/files/72576122332.pdf In PDF document text
    • https://istocdukkan.com/userfiles/files/46055980061.pdfIn PDF document text
    • http://citra.cl/userfiles/file/bumodupewaxadujofo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vupibajupuruzegodariw.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613af77d33f6a---jakuturedifivediza.pdfIn PDF document text
    • https://ubranni.com/uploader/files/54009816805.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/91257954290.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/2338015107.pdfIn PDF document text
    • https://ancoraeducacion.com/images/wipowusuwopof.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/rinadalorikilesuzamatos.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/jeganadubifugew.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/32587716542.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/69308481962.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/luzokojirugevinit.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/lageleriga.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd7beffe6---34521895078.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/79070942297.pdfIn PDF document text
    • https://angem.fr/userfiles/file/zarafotafotupikoguzegenip.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/zufegipurotijofatax.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/biguwe.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/86380759154.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/80237164962.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/laxuwopalezazilom.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfe713d08c---81936575010.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab6524e13---53256023381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=remove+chrome+notifications+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_off0000b6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A5 15424 bytes
SHA-256: 9e7e059005dcb4e0ddc3afea7aae6d242f2f973daf03345a3443dd574d2e991f
font_01_sfnt_off0000ddbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 10804 bytes
SHA-256: 4814bfe966a5f1428f0158251786f0089728105de465167e9dae00edddba1f11
font_02_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1