Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5163781a015dbb2…

MALICIOUS

PDF

70.2 KB Created: 2021-10-04 07:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 350d569005bccfa10b25d31f1892da1c SHA-1: cf9e7e67c83034ab2c332f1c92d57e391d163a9c SHA-256: a5163781a015dbb2180240eab2311c8cab10b6c348ca468a4778488511788106
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The PDF also contains numerous links to external websites, many of which appear to be compromised or disposable hosting, further indicating a malicious intent to lure users to potentially harmful content. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=lump+by+ear+and+jaw PDF link annotation
    • http://dj-maily.com/uploads/pages/files/79339929179.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/32414255350.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/xopus.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83611289353.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/54d9c567c91c73b0b7843a7aa6347313/jevison.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/8268025957.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210919144559.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/femakegavexakotijekagudux.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e39bd75a57a34b848e88096873c4deaf/10715155428.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/85738985904.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/gulaxodujutagetuvip.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021100201090270554.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/xupunovekukuviratawawifov.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/54825381291.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/nuzafukulo.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/nolunikewarixot.pdfIn PDF document text
    • http://canadanur.com/resimler/files/zoliremagixolazo.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/62476339775.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/66042415855.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614fad6ae5892---35479408322.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/nufamulalazunavuzifonibu.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/80779094304.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161569eee4f66e---tagoroledekivovir.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/nalatafebilakalalati.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_off0000b08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A2 10556 bytes
SHA-256: 76b4bdc9d07b1c59af17def69da34f87713b74ddaed7979aa5a46c70b73dbe2a
font_02_sfnt_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 16892 bytes
SHA-256: 5585dc6847ad43d43e3e529e54c0f3bd8870becf4dd398c1d18cc90732cdb9b0

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