Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe138f17c4457e9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 03:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39255475ff5f2aefcf073b683fd6afa2 SHA-1: c451569764deb849e12c61debb6d23f4621679b5 SHA-256: 7fe138f17c4457e91060602eb16da06d0174fb611ba6719c56fc9bc091cd66a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The document also features a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=world+end+light+novel+pdf PDF link annotation
    • http://volareinmongolfiera.it/userfiles/files/57239063343.pdfIn PDF document text
    • http://skolky.info/foto/images/file/73697784687.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/pitoza.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/12402393932.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/rawuxelebavuseg.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/62740432680.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/leneperonikatikimuvu.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/93957408677.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa24bdcf2---kesoxapowefema.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/99812870855.pdfIn PDF document text
    • https://clinicscrm.com/img/files/44204015038.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/xubusowazifuzibivegov.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/82983472787.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/39423277746.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b6a8eca11---56716434943.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109031106448240.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/xonawubezu.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/3913974024.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/supelulat.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/43257383555.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/53471646012.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390916c4413---birizetajexovojigabegegu.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_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 18196 bytes
SHA-256: a647d96d6b7f381e74e50c898ef2b3e2098cb4784a538fe7639a844b4e35d5a7
font_02_sfnt_off00011eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAA 10508 bytes
SHA-256: 748ff3eb09a8539cbcbded0dc8df643928815c5c36d2b0cb45e80e5319ab7a1c

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