Malicious PDF — malware analysis report

Static analysis result for SHA-256 477e3e477cdb6dde…

MALICIOUS

PDF

104.2 KB Created: 2021-07-16 15:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3e64ce7c405a8942e66c65531c293b4a SHA-1: 24f6bba41eb44d5f47bfb765fe4b06b6741dff6c SHA-256: 477e3e477cdb6dde3ac397eb4825b680dc3a4cb789ef6129061d4ed6fdaad510
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to distribute further malicious content or phish for information. The presence of embedded URLs and the PDF structure suggest it's designed to exploit user trust and lead them to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b4d0f08716d6f3689170f8d87addb8a4/27127751708.pdf In PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/92794886317.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/89513132787.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ef39046a3---87773034036.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078a3449a98e---kobesuzetutanodexineguxo.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/felabeberuwusax.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a952f85972a---noxixalurupup.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607df0e29ea07---lizomatofeketosurozamanaj.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e70c3251b2---63446461543.pdfIn PDF document text
    • https://smartdeal.pl/files/upload/files/53800220273.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bcc8d69d0---25126180713.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bed8414db2---40157161788.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7f658888c517aa237313d22593a91d46/bifimowowabosalonalap.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b198ce3a91c---fedagudadubumenaj.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/c3ej2kg4k4pdifnuacjh082kbb/81214928010.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cd9b803a0---47970210214.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734e49ae176---93626634588.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/voluruluwi.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/36107232780.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/47924316141.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/zepunewemame.pdfIn PDF document text
    • https://t2sc.me/userfiles/89925499459.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/8756867088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=driving+distance+from+jacksonville+to+orlandoPDF 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_off00012ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000144e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E4 11108 bytes
SHA-256: 401395169ea90f56c534dc360329fae6a8b15d5aeba62289f4afebf031635965
font_02_sfnt_off00015e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E9A 19688 bytes
SHA-256: d932c7d4ba0d6bf9d296f1b4c2a7676c492d0df488cb99450b3dcb46116ed272

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