Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0f9a5d30764ec9…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 09:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa078ddf1ffdeabe6fccaaeffad38dc2 SHA-1: 87ae691fd597cebdadf36ad85d12b33f2be9dd30 SHA-256: 5b0f9a5d30764ec994025d4e8246b0342d206a5b9c6fe6d5b141b2fd77bc5f49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs pointing to disposable hosting, indicative of a phishing or malware distribution scheme. The heuristic firings, particularly 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', strongly suggest the document is designed to host and distribute malicious files. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/kelewidaxoji.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddb8513f7---6187430577.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/97149685890.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/38152045711.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/64763759711.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/30690885309.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/votisuwefawemixaxuvaropa.pdfIn PDF document text
    • https://cooperspick.com/files/27195831296.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/91938093042.pdfIn PDF document text
    • http://czyxchem.com/upload/files/46618216814.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/rijefudazususagemogew.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/70929637993.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/89002229174.pdfIn PDF document text
    • https://techlan.pl/files/file/nokifaxoda.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/xofoduvimibapi.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/wilobaguxefabem.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/46398731737.pdfIn PDF document text
    • http://oodow.cn/upload/file/210912152315895402gp6x3bwabjs5.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/47436425233.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/nosipegubofagupeped.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/korurovitasuzud.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416761e3c99---vamatinelejujif.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138522685287---rururukodibig.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/49501818096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=paid+games+for+free+apkPDF 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_off0000d283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD283 18116 bytes
SHA-256: 6527795c71f704de44abf107835e19b4a6205e0723f0f01a275ca807ab8b21ca
font_01_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 10684 bytes
SHA-256: ab0d7b18deaec15fa9d7ebfb8d035ab88668fc31824dc1fdb27c8f0ac607f3c6
font_02_sfnt_off00011982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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