Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6d4b9389b0410c…

MALICIOUS

PDF

167.3 KB Created: 2021-06-23 16:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9b94eb992025ff2ceb20286655fe2a51 SHA-1: fc971409fa725a8b6c7cf38e3d788260b983ed9b SHA-256: da6d4b9389b0410c3057a7a469d7338bde061450d349e6bf23a4edb9b8e9aad8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/0ro51bq9oomc5ar670t2iiklsd/luvakiwugizexoxep.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2411cc5a951e00d94b15320798fe2d78/24811679608.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/54006256944.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210616_204654.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/59651887842.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/el3ebet1aimrgjedh6uslt8kk3/32435868365.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077781206cb1---41098785040.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/8268a0be0a85e95bdd5f71252c7332f3/zelepupapufabavoba.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9aee9b648---tikotigawemakun.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed4f8126e8---27961724408.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/18705927206.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f451b26e8bab2a6871ff5cd8a58327e2/5839526201.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/2586998839.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608996228b2f3---lokovidavokot.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/piwupubatadisumuwuzezuguw.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/8c07a7764697d08e958b30f50116e633/86703084982.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/r9svkvr72a2sb3r6vjdjdbc921/vowitowimaxo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3251376e---12459091312.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=optica+en+fisica+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4739436e3425df2209328702cf17135d/59829373612.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23419 5048 bytes
SHA-256: 6eb57bd0f318c547b94c226c1a7ff0ef30fde6fad6d2f4984faf7df2f16fbbda
font_01_sfnt_off0002455a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2455A 17580 bytes
SHA-256: ae779cac6fddb3582ab04f2537afa0f91712a7bec3d72683de0e276785213e1a
font_02_sfnt_off00027910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27910 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550

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