Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a57aa81a86e9b2…

MALICIOUS

PDF

84.4 KB Created: 2021-09-23 21:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cbed426cda868d248c487722eef29885 SHA-1: 69c4e25b786d375361aec73029a19631f2903e07 SHA-256: 78a57aa81a86e9b20be17a87c677b20b4457479dc36047dee42b2993e4d240f3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://drafthe.ru/uplcv?utm_term=bus+sim+17+mod+apk PDF link annotation
    • http://tokyoto.pl/UserFiles/file/30782684362.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/mevinazofinodozuvu.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/pujunub.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/78807593523.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210909_9599CDA919EE1B50.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///90688388626.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/guxeliguwodasige.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/61886553298.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/getebotil.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/38349256687.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b6768b538---46771501487.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/webijotulebejas.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0dbd86cfe0b3e3b12f156d3f69bd8625/60020365601.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/70671140557.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/nigezuvupu.pdfIn PDF document text
    • http://carbonelite.ru/file/48893631886.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613970ac6c02c---79160962029.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/mogedijigumodelajiv.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c84dec20724bdc3ade3ceb50f045a1d6/bezejese.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/31969231621.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/4444bb39be1378d8a14653640fde6eea/71561223122.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b38be7549d---74243355004.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c547f62b48---pozetipezipives.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af38501b06---woponetaxoti.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_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 10420 bytes
SHA-256: f47a4fc0208a5c63ad1e1aadaddf78020486f5022012a632172b7fa3bcd3f95c
font_01_sfnt_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 23980 bytes
SHA-256: 89e810ec9f3784fbc11a3b848b3b717f95a6dc063b0f1d62118fd25ea695687a
font_02_sfnt_off00012bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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