Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecea87bf6008b0d…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 07:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d24f5798b182882f2e8f6fdb73d38ff1 SHA-1: d5afaffe551d7862e64dc6bc7c8681911acd4fa1 SHA-256: 3ecea87bf6008b0d342fd718d7ac05eb8797a70ab86e4e6934fb2cf22f35e8c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, flagged by heuristics, suggests potential for further malicious actions like exploiting vulnerabilities or downloading additional payloads. ClamAV detection and ML classification strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=vpower888+apk+download PDF link annotation
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613016d933e0f---98925670929.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/kepalexivufedajavozemita.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/duriraluzerobarenazoti.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/83961689966.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/dagixed.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109031159023679.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/v6321jeiintru9n3tiovd9k805/78000694757.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/18310554729.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/zigelopuwodumaro.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/93379279950.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/96810126456.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/8756580954.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9b8657a154a6bfa899ef537266dc89be/65599026295.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/rowug.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/82052282514.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/ruxuxawe.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/wekef.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/sejizimuvigurifabotetod.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/gatinijap.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/xemefewosetelutifa.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/birufedazodufasowulim.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/xabizoduvamogowokibagilu.pdfIn PDF document text
    • http://blueyee.com/upload/file/141343115455.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/gezerodowexi.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_off0000d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 10384 bytes
SHA-256: 771ce02f033863bd29c5390d0272d5218a6a38eb3549ad177c914259d7f0e594
font_02_sfnt_off00010101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 17868 bytes
SHA-256: f55184494caa1502b68d5086c379ab4a62f4264742a791819bb7f71c1b2ddccc

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