Malicious PDF — malware analysis report

Static analysis result for SHA-256 679aa61c144f38f6…

MALICIOUS

PDF

77.3 KB Created: 2021-08-25 04:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 496b972b5e9fd073b2e61d29e80ee746 SHA-1: 93d743607c8405b40d7c253cf80fad0d26fbdd1d SHA-256: 679aa61c144f38f659b5634156a48b16eda60a5634979da85df42414543a3ddc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm that points to multiple domains, many of which appear to be compromised WordPress sites or hosted on disposable infrastructure, suggesting an attempt to obscure the ultimate destination or host malicious content. The presence of external URIs and link farms points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098682a8e528---34091560665.pdf In PDF document text
    • http://almar-bus.pl/userfiles/file/rerifitizapofugav.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/wodokofujogolekotosumag.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/eb845c2aa8dbd3f04547d70e5735a444/gapokaviwa.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781737e9247---21108122184.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e01256f9d094228c00581b615c7cd33e/kitonurepikiguwuje.pdfIn PDF document text
    • https://atlantidegattico.it/file/kaxawikopumafurajerure.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/36437039141.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/tedogep.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/15370362675.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ba65531d3---50258480405.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee7d48236---fudod.pdfIn PDF document text
    • http://attlas.center/userfiles/file/pirav.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/91262095292.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/dpiuejlcc53183h79ejlpdqrc7/desifogujogakatasekatakaj.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/66745394318.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/nabibajuvunafufotijel.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/35400710205.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/jijasupovorefakowora.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/62397295874.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611065e023b08---73829638026.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/88211919040.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/62010340699.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/81m8anqc93bqi7ss4si3eqnelp/vizomijed.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76a404af7a---maxetededugowunojagip.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/98945499072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tokyo+ghoul+episode+1+watchPDF 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_off0000cb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 10996 bytes
SHA-256: 3dd254a819760a5809116efbde8090c6799110b5939d6533cab94ad729a17bbe
font_01_sfnt_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 15644 bytes
SHA-256: 0d9735907ae6d57fe9eed08dca1ce3c7633ad8b58c25a5213f43fdb91cad72ca
font_02_sfnt_off00010d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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