Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad5de5b2e8dcdba…

MALICIOUS

PDF

82.6 KB Created: 2021-08-26 00:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76c33ef6bae1dea9fcc0d80d54539f0f SHA-1: 316a68818c7d7104e3227b6fdb1108488bc0dfb1 SHA-256: 7ad5de5b2e8dcdbac69c16b890421c00eb60c4bbd14c714f08b5c5374b622731
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=myekele+mp3+download PDF link annotation
    • http://tsg-edinstvo.ru/userfiles/file/85393422469.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210622_170538.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/999042891b2830b92d6169017e85c01d/gonunirosurijafesap.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/68b3080d48f72ed68cd943d0db02cc9f/kaxububejigewebedomedozeb.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/58942043515.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/8038169154.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/73036105436.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/gppq1geop8j4l863srmi2kmm24/mulutep.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/vajodujubigureza.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/gomofu.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/2a3292adb9745b5e83123a28fb907f79/56407291739.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/fezasabubejinotededa.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16270865374669.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/81151586432.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9749ca753---69830081879.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/zaxarowuton.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/23707461794.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082510475004---zimuladabejotutopufudoso.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079479bb24a3---kinukagis.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b7ae1bc4e---jijumewepoxakug.pdfIn PDF document text
    • http://aven.su/userfiles/file/84567734140.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/92652107506.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/66853143419.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/3vj3has9h2ccepv4bdisamm1rd/turezasibafusemukikolalu.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_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 10552 bytes
SHA-256: ef5806ecd02c320fea92cb06516795bb5a9c55ee1d109e0c563e96367054f593
font_02_sfnt_off00010fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD2 16936 bytes
SHA-256: 39da69685ab3b569c7b034962365d9dc2fe6dc6db6dd4f66a953055c29cd69a3

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