Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae21941d52ef425…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 07:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44c7b2023be19e32bbc1156e1aa8fbac SHA-1: f3366f2722699fc642e24b438d47257fddfc84fd SHA-256: 6ae21941d52ef4253b80fd2f69345c690dad97e2b4ead0b4e7a91ef203715c48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Heuristics indicate it's part of a link farm pointing to compromised CMS upload storage, suggesting an attempt to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://lifo-sea.com/ckfinder/userfiles/files/10698972649.pdf In PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/sedagezalugerefijele.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2c5eb98a7---fowezozufexofutezadul.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/78197645155.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/3da452bede8d1e2786cb93f4aa7f4a9e/valavilexuvexokone.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/dinidukutojafugagow.pdfIn PDF document text
    • http://sin-hua.org/userfiles/23103509471.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/jujelolomuvoxoxe.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/51023787295.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/38258918862.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/verupukikivo.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0801d92fc05a22f1a6e9dcfbd1662539/94195873385.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/6700438901.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/87946746599.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/92926296910.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/25638833623.pdfIn PDF document text
    • http://talleresjpg.es/img/file/90113594148.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/regorejebumebopadiwo.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/48151758782.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/94074291624.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/577346757.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/981088966.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/wizev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=antarctica+88+full+game+downloadPDF 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_off0000dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 11024 bytes
SHA-256: 1d84b06fd12391df009f1f0395cef519fc018f47ee5fd9461931ad44c4fa5b77
font_01_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCD 17684 bytes
SHA-256: 4423c8fe5af003b9b617bb3de289e714d273e9a94f33aaf8b546ebbde56544af

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