Malicious PDF — malware analysis report

Static analysis result for SHA-256 498fbf2d65574a28…

MALICIOUS

PDF

99.9 KB Created: 2021-09-03 11:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96982868c13e4e7197ba26cf556be94b SHA-1: 2ce2ab0abc12b03f0284876a9cc8ca7fd0c29d7e SHA-256: 498fbf2d65574a28c1e4217dec7a6de166fda99802b5078b399c54736e716a04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to farm links on potentially malicious or compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://drafthe.ru/uplcv?utm_term=omb+circular+a-123+-+management%27s+responsibility+for+internal+control+pdf PDF link annotation
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3412d2528c---76355340233.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/550djq7en8stuh9ldkc9a464a0/wimileronapajejiwetubu.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/e55616b67ce41584f15eafba43937b7d/47161874090.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/46812067550.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/49228049289.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/36033201893.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/pasukizixilafomibo.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/17247238741.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/5dbe5bed9b9892c8a5ce35ac4f85d02a/zuxovasazosiwelivuxo.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103d89d77362---lasagebinokepexakobu.pdfIn PDF document text
    • https://master-service.ro/images/file/20208925009.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/sotivuronufuworagopati.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/kawafipitabupatufajavona.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210814115418.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/jaibr3rl7l0o9amrdgengie4b7/33963873574.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1abf4b8274782db4a9ef39fb396a806b/120821523.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b03acce77d4---93223644509.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/xedejodesalafim.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/t3876ki4gvoblivm0v7lg0bqo1/zazaromenologuso.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612e558eb9a56---riwubewasoja.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/sevikonakagim.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fff35a74e---30455207917.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/57539387391.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/16538921326.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1e327433---3513314508.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_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 11756 bytes
SHA-256: 20e2196801602295c228bcddd4ee0bb3fc709f62ab215397048b80c0ea92be73
font_01_sfnt_off00013ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E9 17448 bytes
SHA-256: 87aca2c72f4cd0732ea311fb4c07a5a3baeb3f05a5196a5c635ef1ee1f11eac7

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