Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ebb16a8794c7f50…

MALICIOUS

PDF

77.0 KB Created: 2021-09-03 03:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8af8367d41b4904081ab7608cc40aa72 SHA-1: 2131122cc62fed7896b9cd8aa1df47ffa8c3e6ff SHA-256: 8ebb16a8794c7f50904e9e27e96963ba731c1556382e73f3deb36b2dbee55f0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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 http://beiwendq.com//data/attachment/file/narir.pdf In PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/matefi.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/2994135325.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/271224198050.pdfIn PDF document text
    • http://rayer.cn/d/files/79384141825.pdfIn PDF document text
    • https://mcdpiti.com/userfiles/files/90878140539.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073150d439c1---jebamufizabaxugasixo.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/67157606340.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb080acd7df---17066701915.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbcd0f1cc2a---xawabituxal.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/rokubozawiwojilomofegut.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/86437002112.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/mivepalejode.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/bajewuluduzi.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/6152554296.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f1728ca4ef2---wepozirilibozometotaked.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb85687519---84493882301.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/kerada.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/mibejasizugibefabuvoliz.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/50995325425.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/95701097278.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/posotajepijota.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/mofiduboxejukovoziravoze.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/wimetozipatusopif.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/009ec3f9103a7e6b34c77e1372bc5c6e/17303532606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=vba+worksheetfunction+norminvPDF 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_off0000c72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72C 17316 bytes
SHA-256: 1540089aaa70f6c57fdabc09a08ac19b11efb7edae3364ac3b3af7b8587b47be
font_01_sfnt_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 11008 bytes
SHA-256: 5a83d96b1cd760f01be5290454169c94ecffc65dab524b4b295460551b484d32

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