Malicious PDF — malware analysis report

Static analysis result for SHA-256 544eb85f6de5e17f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 13:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d48a9b07cb17e75e867ac5408b6a1301 SHA-1: 0cf183c155bb39ab4d59be76450e8e25648c5467 SHA-256: 544eb85f6de5e17f12b65e5877f3a03867cb42e9b42b40f5a2f945ee081d953a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://thrifthelp.com/flash/thrifthelp.com/file/35311928960.pdf In PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/tosikoludupizopoxapajetol.pdfIn PDF document text
    • https://vgcanada.com/userfiles/file/pavufedixirotoj.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/sawixufitujutodur.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd3426c4a---52523862966.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140243cefa48---27751126690.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109170043223445.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/80819600443.pdfIn PDF document text
    • https://rotitelor.com/contents/files/zuvukobimuruxukoxu.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/xexabobiwafojunixibewawe.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/mudeboz.pdfIn PDF document text
    • http://dsraxys.com/uploads/xozudixan.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/relubomubavowubariv.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/38765c06124ce2e56b2dbcf42a207c69/jazunifudeder.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/89281708643.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/jizezinas.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/19953834231.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/82210958309.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/vujemekupujepox.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/94512737458.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/vimofiwujigesematobo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcd816935c---21591193544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mulan+movie+2020+onlinePDF 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_off0000d6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 10304 bytes
SHA-256: 11abae9646505b0e8ca24f8c027f1bd69b87e78c61e50c9a623ca942d018950d
font_02_sfnt_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 18312 bytes
SHA-256: 8902cf1fcf1a19a92be7409e2db701134a995041ccccfb5226064b7aee83bff2