Malicious PDF — malware analysis report

Static analysis result for SHA-256 55892e860778f706…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 10:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a73921a12cd236d32c5f340d9e528717 SHA-1: 37d454ad0f527cabc5a486e711cbc45851ef68f1 SHA-256: 55892e860778f7065098fe429de324a99a4af7cb61a16baae942045735ad5314
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent, likely to redirect users to phishing or malware sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=how+to+block+spam+emails+on+android+phone PDF link annotation
    • http://moscowfashion.net/content/xuploadimages/file/11060376498.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/fikibinarozaxodinu.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/penubebuvatomegis.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/77447824312.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/96822088515.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/65869270562.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/27645332042.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1ff1a98f6---15935380214.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/sibotajato.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/17332288686.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/xipuzipotoxosusi.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/7180792247.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/bejezuzab.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/33809735058.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/11386022876.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/13540401914.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/89531771644.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/57592410790.pdfIn PDF document text
    • http://warehousetraining.ie/images/podub.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/mudemunujunugez.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1f08dfe26414759f19330518ed2c3fa3/pewaxo.pdfIn PDF document text
    • http://gibisch.org/files/files/folazi.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210918_185120.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/akrhlr2rb8imgtplp13aon0er6/puximu.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_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 17856 bytes
SHA-256: 22e75d7f2b9c91c1f718efb9f2f121b105b847596ec38dc15e2c11e50a9b9600
font_02_sfnt_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 11088 bytes
SHA-256: 0d911a28b909808c3bda2e62b8a0fa8d1f79a29b375aeaeaf67a7b6792905301

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