Malicious PDF — malware analysis report

Static analysis result for SHA-256 990415f772dcc1f8…

MALICIOUS

PDF

79.1 KB Created: 2021-09-21 06:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1aae59ae62b7945dd3d24a43924f3ae7 SHA-1: 10f9ac53d48c260c44ca1a0b3dc08aaf85d273c3 SHA-256: 990415f772dcc1f8ae25fb326672c75e29748708977a975dfe69c044c735ebc0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution attempt. The presence of a 'utm_term=download free capcut' parameter in one URL indicates a lure to download software. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=download+free+capcut PDF link annotation
    • http://otevrel.eu/ckfinder/userfiles/files/38840463790.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/xamolelikebewikofe.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16141687711980---rofixibigabajoru.pdfIn PDF document text
    • http://chongros.com/userData/board/file/gopowe.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c33472ec81f3b93910f2ad9f906ca86b/lefeku.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/73760998773.pdfIn PDF document text
    • http://susutour.com/userfile/file/99716673642.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/lofedoniloz.pdfIn PDF document text
    • http://salt17.com/userfiles/files/lisefavegokejutugupidojam.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/44518357662.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/24442723995.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/19084205385.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/2851845796.pdfIn PDF document text
    • https://ccskin.com/geektic/files/38973038144.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/vexitosumit.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3487da80d---96467017015.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132309fc55e7---tifomimeponoxovo.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/vuvapanisinelelulibev.pdfIn PDF document text
    • http://01host.ru/userfiles/files/jizirerilojuz.pdfIn PDF document text
    • https://eventaipei.com/upload/files/fifujutugul.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21582213867.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/33557088374.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/tutavijim.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/19133993042.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/70694263369.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_off0000d16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 17244 bytes
SHA-256: 3735401a4a117697cb6ccdf0c04439bec4091b10c7b66828d85050d2bb999e6d
font_02_sfnt_off000116c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C1 10540 bytes
SHA-256: 841da65c75ae6a4786fbd03ad064bf91d064dd691d7440dd74fa0cd6020cc506

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