Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cdb49b40f7c3e8e…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 23:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01dc98f3fdb64b9f85a93ba47c35a2c4 SHA-1: 374b18c2a5417ff8e23f2c4546a8e9dd6639f7be SHA-256: 9cdb49b40f7c3e8e5600d2b3d253ccca7b5954f49050810a57c693828d8df8cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to compromised WordPress uploads and other external URLs, suggesting an attempt to redirect users to malicious sites or download further payloads. The presence of JavaScript and numerous external links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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
  • 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.
  • 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://chiangmai-clean.com/user_img/files/40165205174.pdf In PDF document text
    • http://podarox.ru/public/files/7165556219.pdfIn PDF document text
    • https://cardolf.ro/files/89924982845.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/xulufakenok.pdfIn PDF document text
    • http://letnaterasa.customreal.sk/data/files/77092872754.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/49756364602.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/15842136645.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab6fd68a87---23089450722.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/80498470618.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-10/20210910180146467031.pdfIn PDF document text
    • http://weldingplaza.com/files/file/nogipurirujifefonajusof.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dfe91a6d56---25611805831.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/vozuruzowitek.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/lovoxidajomadozolu.pdfIn PDF document text
    • http://short-story.ru/upload/file/90947092099.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0af2dc8ac---69471737667.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/29449285884.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/84036818199.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/rf2r7at9elrd3svvfjvgvev1b8/pawodevonidakeviv.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80281522236.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/15457442461.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/i16s18jekelr0mo8ndjssn4m3p/758634667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=live+t+v+for+android+mobilePDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/rogugelulazuzufebedidi.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_off0000ae55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC667 14956 bytes
SHA-256: 03c99cd0f7f878a6d633170073c1aaf985004b6f9b50a077a5960d47f1109015
font_02_sfnt_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 10512 bytes
SHA-256: bbd4492465a50062a985a99fefb480710b9f70fc522bcc0c435d4d974a40f62e

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