Malicious PDF — malware analysis report

Static analysis result for SHA-256 767fddffee79ec2e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 22:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be248de6458192fa567c8a46c79ca9f1 SHA-1: 8f6554378d4c22348be606975e6dff2013aec095 SHA-256: 767fddffee79ec2edeb52805a278c5c174acf10a1c06f36748bda2e19ea407cc
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 URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=for+life+streaming+free PDF link annotation
    • http://ubestsports.com/imager/files/20210912135431.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210914_3E50C4CD8BAB5100.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/mipisevebo.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/18758696721.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/4b7d1288caae05a416f33a7afe1ebf50/95626111253.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/xevefejifabajit.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/razoxofetiterodegag.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/kegesesawakuxupofulanirap.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/xapibuxo.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/31937375533.pdfIn PDF document text
    • http://kaies.net/upfiles/file/fowolale.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/buzopazirolikiv.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d265bb037e---musulep.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/famewadubizepiratirowur.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/ponakamevasigulutek.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131f7c2b90f6---sotusevuzudibeti.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/sozulisesasuve.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/150914780.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/69589370549.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/nezujevibig.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/feneb.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/62990349344.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/ronagaruwuxobagasakujuvez.pdfIn PDF document text
    • https://digireg.gr/upload/subetofuguvebutof.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_off0000e1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 10532 bytes
SHA-256: 5c1ba7dc2c27c4315cd0bcc2f3de0668a82a69b37fd06de542edebf0be9ce530
font_02_sfnt_off000111ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EF 17576 bytes
SHA-256: 6556b8d7e506814ba3c71ae811d424785c7bf4e2f6f019d8a4f116a888b82935

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