Malicious PDF — malware analysis report

Static analysis result for SHA-256 543de8e113f8c007…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 10:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9abd6d6c5e92b6fda97f25e323d9175a SHA-1: d1534c0068f0d827f9c34a44f600d00edc84abc5 SHA-256: 543de8e113f8c0077cf2f338704e7bbc751411a1e05cc1bed36e37f97d8bdbd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users through these links, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vldid50dshqc8mkb02hc4nm7rn/72121299666.pdf In PDF document text
    • https://nhachoxebus.com/upload/fck/file/37296368669.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/84652432705.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a4da7576---muwalev.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/gorivedudulugegeb.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/38ab987bfd4e31585c90c8ccedd53274/tililonokidafiro.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/rrcgo492tarb11okmablnl163n/81367348523.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/koniwobidasujoweku.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607181dfd30b6---87217663265.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/44576225451.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/02297bd79e1255aae51d151d4f9fdf9e/renijukisaxiziwafaki.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/wowibuxanisivor.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/22022306353.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110edcdcf906---61549379446.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/lugenubenekidutuxerojuda.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/70631010181.pdfIn PDF document text
    • https://digireg.ru/upload/lawowivemejojagaj.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/nexewekuj.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/xisofuluj.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/51516083056.pdfIn PDF document text
    • http://dongphat.net/upload/files/ralanuvupapi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/1f6e8ac99b213c8200cf03efc753ee56/kuluv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pdf+editor+download+for+windows+7+64+bitPDF 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_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 10868 bytes
SHA-256: 890822a25fc346182154654f40083ce6377ab15c00f6541ae89589288868a242
font_01_sfnt_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 16276 bytes
SHA-256: 2465451774c01fc919b26700a8e8721235047c00259b6301c4fefa295da7f134
font_02_sfnt_off00011e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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