Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b078b9d3fc8a96b…

MALICIOUS

PDF

79.0 KB Created: 2021-07-08 04:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9bb3410073683ed74de22475f20a68b7 SHA-1: 50152b27c70b865eb20a369624aa2289711abc5d SHA-256: 2b078b9d3fc8a96b2eb878bb3c9b297d4f455ed71144e6d0e7c7e99a020a9300
196 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests this PDF might be part of a multi-stage attack where a password is provided to decrypt a subsequent payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a100be081eb284ebf8f9e0ccd7adfaa3/22165949707.pdf In PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/muresagujeri.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/49125963219.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e7e6f1f79a76e24b83a1401ee9adfe57/refodekesukowosave.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/91026912103.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e6ddd22c2---1111466445.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/51646184782.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/xugabaroki.pdfIn PDF document text
    • https://cncunse.com/d/files/50066690519.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/derafuwebi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160de121f069d4---zubekisibiwadesasirufige.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdafa66756e---repikekokogumemuneje.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/59260135047.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1d734a6fc---68632041398.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9866ab5cad397c65580c022b119ee7d6/48470001239.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/vilokef.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/652ebb53ff38a8da92a1a5b54abc8eb6/97167237832.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/laligebedudeg.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/nipibivivep.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/30c2004e64719b97f7ae987274a674b1/48681561993.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/78168236223.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/91503840786.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-25/20210525192549676953.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/nalixogifudaxu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/9bef8ad4e3afc3624720e465b8774255/nipofaregomufima.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/nigijonofag.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4fd3f0960---zosaton.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=statistical+treatment+of+analytical+data+pdfPDF 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_off0000d1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C1 16440 bytes
SHA-256: aeed0e5049fa41fdeb013d5dd205dcfac96010dcac8e7168bca1522952aa959d
font_01_sfnt_off0000fc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 10972 bytes
SHA-256: 9e746218c0f9c7654e41c2801fe1db1255356e61ea3d43e97ec4867b1581f531
font_02_sfnt_off000115d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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