Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4903cd80e95fede…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 21:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f4af99dcb7e5f8c0c03591e1c4918b6d SHA-1: 2d18acf4579bc3618cf85804114ee5d5817f27bb SHA-256: f4903cd80e95fede3d51864689379189683bddc49916074b28eee26d72a2e689
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating embedded JavaScript and external URI links. The PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of embedded JavaScript indicates a likely intent to execute malicious code upon opening the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://cructi.ru/uplcv?utm_term=mp4+juice+free+download+video PDF link annotation
    • https://jotelek.hu/files/file/giwukinelidijitidejidi.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/28242055698.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/13344508825.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161391a81b75bc---wadafi.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/53733325710.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2eab6ca95---gajudafufap.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/61797581983.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/29878923742.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/sizojanuwulilojowa.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/gosefikesuxaf.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/d37s48g1ova687sonvogc3mjgn/dipuvadifefo.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/suxuvuve.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/28744371280.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/newidanebesonejamukevedos.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/24936660709.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/79766337430.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/98976871582.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/luwesuwakud.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/67842191143.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/makeka.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/89308438939.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/84547937521.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/zofezebagomodozunaraduz.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_off0000cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 17312 bytes
SHA-256: 38e12d604258841b402204fe068426cc482cd5e0f35c25b0b9c1792920ebe381
font_01_sfnt_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 10800 bytes
SHA-256: 9476954352812fd5ab9d1555d4343e1a256916c7d8aaefa25d4412f276b0418e
font_02_sfnt_off000113b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.