Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc9417fc4ff1f0f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 23:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf66b1df104894a0f0837ffd88668a1b SHA-1: 1e0dfcad0710872d47d69e4e1221cc89ca2010b5 SHA-256: 9cc9417fc4ff1f0fa330d452795012f51be53769da60a59c75a06a293758204f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to execute malicious code or redirect the user to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tuzoltosagmihald.hu/userfiles/file/84008635081.pdf In PDF document text
    • http://horizonpestservices.com/userfile/pimuv.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/53986287646.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109152211148925.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/54304275492.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/88701456969.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613687beb2ce7---mufopisidifur.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/libonepozetisotide.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26554609171.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210904231810.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/8740021962.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ogogt7t886qg42prj7qqt2kop7/wuxotavariwubepevatego.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/67545514182.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/11801648357.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/66563689014.pdfIn PDF document text
    • http://potya.com/fewixomupezixajelapo.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/62786024588.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/jepukaka.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/xijeravumululerefo.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/158365329.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/fajavojoduxekiromo.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/55518067011.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/63c8c900ab789a400bd5dcb3d1e3b3a7/84393761382.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/99663371985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=root+dictionary+of+internal+storage+of+phonePDF 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_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 11056 bytes
SHA-256: 5504eb2427b8175d0cc9a3b708479523a8fd07e43e4c776eae2112761f1cfacb
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 17548 bytes
SHA-256: dca63d08a4af1be3dca2e048ba3d96bc3b18b5cf7f81d424819b05bbd559cd8f
font_02_sfnt_off00012f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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