Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3dda23a654a4c30…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 14:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee3684f163ff90a4e2b89ba9888014db SHA-1: 2d7537b6d7ae128927baffc1523cddd7a201365b SHA-256: c3dda23a654a4c302bfe67f718c4f8cd2bb5f0e2f83829bf4395965906fc3706
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ketchas.ru/uplcv?utm_term=aeration+tank+definition+pdf PDF link annotation
    • http://allaboutdowney.com/userimages/28375944819.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/60049675467.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/45793732279.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/74414785461.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/62777171171.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/kunadeliwon.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/butogovegal.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/65582785800.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/wigulakofap.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131258f5a538---viwoxe.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/zubejagironofenu.pdfIn PDF document text
    • http://ellev.fr/upload/files/sanasovonejuzufiwasuzef.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4c2eb407---25488473494.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613369f71faf1---tejokekividasijoduw.pdfIn PDF document text
    • https://esz.jp/img/editor/files/nukitetamu.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/92429992790.pdfIn PDF document text
    • http://speckrepej.com/upload/file/loxarawog.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/11500222080.pdfIn PDF document text
    • https://guijek.com/userfiles/file/28141772270.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad3b78e46---28475973223.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/nifejifepufigo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2ec49906---72726998645.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/fotuwukovev.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/xiwijuradape.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/q4pf73m53qcmn750qad54flc9j/jeril.pdfIn PDF document text
    • https://cian.hr/userfiles/file/kobapimen.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_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 10352 bytes
SHA-256: ff76a6ab0d826629c2bab2077ad8cd83f3a630da6b5e354880eb53775397d8a4
font_01_sfnt_off0000ff15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 17632 bytes
SHA-256: 66437420693722980ae705239cf491fbc97708e53d30f9cb74c95389eba00443

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