Malicious PDF — malware analysis report

Static analysis result for SHA-256 49545b0c48349ee2…

MALICIOUS

PDF

84.9 KB Created: 2021-07-17 14:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 35874dc289ef99adf9351e8ef3382bb8 SHA-1: 12755c30ae6b903e1cb4adbb8cb2abd55d240441 SHA-256: 49545b0c48349ee26a276b334e92b9dc631bb1914ddb2e3fff40b5f7e5bf16cb
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, which in turn host more PDF files. This indicates a link farm designed to obscure the ultimate destination and likely distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607402e61e58d---66746632486.pdf In PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa91c7323---42938124288.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/55376485583.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/gujipawogur.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9f767c2dc---molemigeluduguk.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de3559d6a2e---70031492696.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/karoxu.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/94670593915.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/add6426fd50f6920bc21740989a26f43/22934581117.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92367d1347---mikevojuz.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077c617c13fe---fugodufegudebunavulolikux.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/belogikavazakowerozokupib.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/2572563151.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/43795223926.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf972aa4502---teliruwajis.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/morite.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ivodevs9mr7s07pbcu4glft5s7/pivepotojexoj.pdfIn PDF document text
    • https://anfauglir.com/images/file/39232849802.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/sukikutigedajedosi.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb805d27a97---56465289362.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0020ef28208ecf68f06ad414d74ebc75/rasileborip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lumiere+and+lichtPDF 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_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 19776 bytes
SHA-256: 9ae5a15c5bf5ba2eedcaa89e457634ed627f63b3b86c632955fbd8fa020d5733
font_01_sfnt_off000117a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A4 10404 bytes
SHA-256: d385d0200b5df85ae1bdf415a052633ecc14d2092f62a628f03192bcf11e4828
font_02_sfnt_off00012ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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