Malicious PDF — malware analysis report

Static analysis result for SHA-256 515e8dd08bbad09e…

MALICIOUS

PDF

80.4 KB Created: 2021-08-13 13:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e7facb0492d9820c3bf01bb1404eebd8 SHA-1: b5c0fb94c449430d72d607d09732611a4c9235e9 SHA-256: 515e8dd08bbad09ed6fa4a5a21d3c0177336982da45db21f7426ac78db3817b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript, though not fully analyzed for specific actions, is a common vector for exploiting PDF vulnerabilities or initiating further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794fb8baa83---80111417194.pdf In PDF document text
    • http://grupophi.es/uploads/files/33032221056.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1631b127b---tesujetebir.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/14e586d0540b83503452a45157d48d95/tevetofavarena.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/40448103453.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/jekunugikopobuxe.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/20398624405.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/wefusimirolijodowafebot.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/2169857806.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/jugiduxusasu.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/94529084621.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/79507710613.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/99707013400.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607770b869b50---jutebefigidemopamiwizuso.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/55896104871.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107a25983ea0---wufumejojoxegudukes.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9563da40a---texaxadoweb.pdfIn PDF document text
    • https://defi128.com/userfiles/files/13640270923.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0baa97ae---3289064242.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607374896cffe---bivaripamusexezu.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/875f09d32fa4566bd6e713fd38dcddd9/kitisenivawigigupizenewa.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/60873513806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=biology+eoc+exam+study+guide+answersPDF 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_off0000d559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD559 11168 bytes
SHA-256: 28d8601795e4dcb3cf1e34f8a3ffbe0700376ac2b4142615336ce291264a34e2
font_01_sfnt_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 17020 bytes
SHA-256: 1528c05027cf4f2a9afab7d8b3c6f58f52bb0f3d9a8ff151472c702695916c4b
font_02_sfnt_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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