Malicious PDF — malware analysis report

Static analysis result for SHA-256 7031ceaa5e21708d…

MALICIOUS

PDF

71.7 KB Created: 2021-09-05 01:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2568146823f32da528e309044fee3540 SHA-1: 0f99a45a9a83037c06425fbd7d4111547eba0027 SHA-256: 7031ceaa5e21708d3c3820bf467e95cd06a3354bceb0bf91b3f3a462961e2312
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 high likelihood of malicious intent. It contains embedded JavaScript and functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The primary goal appears to be redirecting users to potentially malicious content or phishing sites.

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://tonymusic.se/UserFiles/files/soxudoninipuwa.pdf In PDF document text
    • http://adance0112.com/upfile/editor/file/letokin.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070064704115---gewadipefuganopup.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/87032643352.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970a153169f---poxitusilovonasoxize.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/33633482942.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769a558c518---bimakom.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7463ce681a---dupubodukojanomavowowaz.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906fd345dba---rodexapatokilajapisuwo.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca25c20d8a---dikisasevevubobakivabe.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/xexajusob.pdfIn PDF document text
    • http://steinemann-ag.ru/sodatokuxe.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/22999843340.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/35b99605f1e8073b6c65353ee11321bd/pojuriw.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/37056411961.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/worabulebuwuvisimaxuwe.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/34968559294.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/mamenobejumajerinexivom.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210825/file/16298537929964.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/fazonegazov.pdfIn PDF document text
    • https://resicolor.com/upload/files/jawivuduxe.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/waxodil.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/valeguguvisenej.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7de7e6b81---50662099620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=prophets+in+islam+worksheetPDF link annotation
    • 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_off0000b98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A2 10696 bytes
SHA-256: c4d49bb8a2e426857bf77b8769d71ec60611044e48ff1d6929db196289eeffcf
font_02_sfnt_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 15340 bytes
SHA-256: ed05709559d10f127ba52f533d558444e61206febaede258bc1f7025f4498072

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