Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae806230c0275c1…

MALICIOUS

PDF

93.0 KB Created: 2021-09-06 07:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9fa94521f8b82f57a86a0fdd4064bad4 SHA-1: 68700827eecfb3b18d998eb31a70904a0119d7e2 SHA-256: 3ae806230c0275c12652036c77452ea6d039caf5b69177b9e330e73948fd9b6e
176 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to external sites, some of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious content. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cedarvalekansas.com/clients/875954/File/vazetive.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bace3ac5492---59991901657.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210615122654.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/69033857119.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/52174797399.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/99381616450.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tuktioct7otr0d2jqqr7rctkun/zemonibupogiluv.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/budojokutuvazo.pdfPDF link annotation
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b31e493d---58124751965.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/64113648715.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/90674518958.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b57a88e60---94165233990.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/56922214365.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f177e36686c---14676359281.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/ad9fedefcef9e542b0b31f32ee166a76/32352632148.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/38792897580.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210509213840816.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/rexuxa.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073f0c9541a0---gibifediberufujiloxazer.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/86834647810.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/b00296f86da95cd5ef0702d5cce09433/sudixeroguzeviroluba.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/jevasudusifevetotif.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rodokopuziledovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=small+scale+industries+pdf+notesPDF 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_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 18072 bytes
SHA-256: b570c75798f189037ba9f71728809089839c3011fe95eb523bf6044e595b1f9a
font_01_sfnt_off00013548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13548 10956 bytes
SHA-256: 934c7b012180ee6a6ef712fb1ddea2d67c815fe23d6dbb2c7cafa6b8d76974aa
font_02_sfnt_off00014e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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