Malicious PDF — malware analysis report

Static analysis result for SHA-256 611eea024a1ebea8…

MALICIOUS

PDF

73.5 KB Created: 2021-09-02 20:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aabfbe36e015f9c6b5ffceef086ead1b SHA-1: d7070a5a8fa6ac01f007e45e4470f86897ca35b0 SHA-256: 611eea024a1ebea8b7fbf282bf4896d6d17dae343dac38afec8f8a0b161656a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=pronombres+posesivos+en+ingles+worksheets PDF link annotation
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/fowawesajisaditedukibe.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/98458549391.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d94609be16---65836113198.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/gofadotabefazijetutur.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/5dcf1afb1919e1740caa648400d89866/99749982356.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098aecfc5fc3---78820973225.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/rivowigoposatogurifu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4b45461a7---rusuzazolijaguji.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/37337571010.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/gebirujoxu.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/jakowimuvu.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/66650617370.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/78110295405.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/12314877709.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/49272549953.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210814023644446.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/xidibebiwevexal.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/lebafa.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/suzok.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/28505883563.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5a82ddeea---gukuzatotujimetodejawetes.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/14768110066.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/10585351016.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/21603618899.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_off0000ba39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA39 16924 bytes
SHA-256: 17b4106516083ff595726b4f00fa0158f1af6e22587dbf376ada8ec03c8b6902
font_01_sfnt_off0000e5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A4 10920 bytes
SHA-256: 9415d36629ee4f532f9e07fd62a752aa0d38a6f69078806818ef6b7a00cf7571
font_02_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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