Malicious PDF — malware analysis report

Static analysis result for SHA-256 9caea1778eb8d48c…

MALICIOUS

PDF

80.5 KB Created: 2021-08-30 05:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 83f80b36bb4914443262275aea9d295a SHA-1: 497f42bc04dc2238e0d69d9c723fad093e9345d5 SHA-256: 9caea1778eb8d48c6cf61dee38ec28fa877dab1ed41e60435c0c607efddeb4fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable domains, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://splogservice.ru/content/file/45690203689.pdf In PDF document text
    • http://megalaserasia.com/upload///razamajudefakigogugile.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a14732e1079---depovoxeveru.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/69566013553.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160775e67c6e83---fuvebiso.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/9537530443.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/44734510848.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161152e6219008---xudajaximadowujiziwirom.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/58283784159.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/xijefumipotuj.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/47479b59bfc65066e4c699d20be983b2/43230026711.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16070a4b36bae9---seliwokofizudimij.pdfIn PDF document text
    • https://beaszemin.com/files/71235936279.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/baguxajevuxo.pdfIn PDF document text
    • http://www.toptehnik.si/images/68518697275.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/kobuxode.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610b2fc170370---lunuroxexak.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/tinunevurepagon.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/32707586453.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701f7c2096f---64711908147.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/554597704ae1fef0878756701b2d751c/kejezuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=life+processes+class+10+important+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_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 17416 bytes
SHA-256: e145370580625cb82c1aef63b0f9e6f14cd446622b90aa95e33164b94be54954
font_01_sfnt_off000102a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 10772 bytes
SHA-256: 95227d8313e0d00fe800038c267d9138baae030ad0d2e10b3636189b78d8885f
font_02_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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