Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d119fe87c5dde36…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 04:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9732e0447c975aafe1f45e3e5f89b9eb SHA-1: 96bbd8337826acfeb91c6c4c8498f508a30d9e8c SHA-256: 1d119fe87c5dde36e51287aa5a598884cbe4be916af91274822a757b565f62b7
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 phishing or trojan threat. It contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://pistant.ru/uplcv?utm_term=four+letters+words+starting+with+a PDF link annotation
    • http://travelsi.ru/ckfinder/userfiles/files/fifejiroz.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/47740848777.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109080552538920.pdfIn PDF document text
    • http://abwessex.com/uploads/files/kenelapiwojuxu.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/nijup.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424a4126ceb---11904224480.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/rosepeduxabad.pdfIn PDF document text
    • https://greenways.at/userfiles/file/29588326851.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/rifepogorode.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/60118610112.pdfIn PDF document text
    • https://hoalavender.net/upload/files/widarexipelurixub.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/61190410529.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/tazipapurisufuxebib.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/53144174475.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kidiromoduxodamivijo.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a7d29a6d7---3969148551.pdfIn PDF document text
    • http://firegallery.ru/img/upload/bixoko.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/96682341893.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/49576475509.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/5e0519e68acf21d5f834c6f822e93a5a/sedutusatapekuk.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/25887847629.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/88087895584.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed7eab89f---8311962798.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/75483846965.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/wirobekexesovidedi.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/74623299469.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109190559305606.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_off0000ce24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE24 18004 bytes
SHA-256: 7f270e6df7fee1cc1d55c75aca335ff6e70f542bc1716927ea8f7946f96921c1
font_01_sfnt_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11412 10688 bytes
SHA-256: 8251488d5ff8df6ac4286c755ba014032e1b9af19de49f14bdbcf0d2e90d9184

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