Malicious PDF — malware analysis report

Static analysis result for SHA-256 22dd05123d6d6d18…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 13:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ae173fad7f059225e60ab567095c132 SHA-1: 9a30b58f8a3c16560858cf5de4bda158bf6a795f SHA-256: 22dd05123d6d6d18825c1774fd2a6e00496ec82a503b74e8511c823893187aeb
184 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate it's a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rayocazar.com/images/elfinder-1.1/files/file/71470439870.pdf In PDF document text
    • http://bfttacg.marketsearching.com/upload/files/lanozud.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/47434301511.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/68640467338.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/girefeturovi.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca7aa913d---duworusurubug.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/fukug.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/86864165410.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/52949832318.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/13990328215.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/89706567051.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/35353670969.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d813d2aeb7---58022639637.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/xaluti.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/16110655609.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/65207101560.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210918044403353.pdfIn PDF document text
    • https://eclearusa.com/images/file/kefulibe.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/80583049264.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/57c5259b51143dbe79e94c78392d6f6d/81848790447.pdfIn PDF document text
    • http://lachina.cn/upload/file/2697723417.pdfIn PDF document text
    • http://vietnaminsight.biz/ckfinder/userfiles/files/xawiwebuvunewimizupogum.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0f2351e339154aa49f2582f5b832c647/putigevujerokesobufoxuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=connect+phone+to+wifi+using+wpsPDF 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_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 10668 bytes
SHA-256: cf5c5c42ffe9204008c300582a81e35577236f0b592ffb20d954b65561fd6dd9
font_01_sfnt_off0000eb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 18892 bytes
SHA-256: 59ce4a8cdf580736c68a9757adff9aaaaedcad6c85f2e66e1f909134a952b919

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