Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ea3e44fa7e992a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-07 11:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62bb6f370836dc935700b7d961ff0018 SHA-1: daea22adfa62304c50c71fdfb46eb63bc2ac82fc SHA-256: 92ea3e44fa7e992a5d712bd7a458e31844ccf826b56224d17c870c4efad1449c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage, suggesting a link farm designed to host or redirect to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/59bced66d24038b01ab45a667eed6237/sowiful.pdf In PDF document text
    • http://billedbutikken.dk/articlefiles/file/zamomewefupuraxulozowoko.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/finekopinodize.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/61295987017.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/giwinigoderixuwoton.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9f6e5a4a---34945516815.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/68771135406.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210821_4BC0C4DFD7762441.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/41009758821.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/64922096696.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/96347431934.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/fasekomisijoto.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/14230038737.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097529603ff3---ripedap.pdfIn PDF document text
    • http://climtech.com/files/files/76136191282.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/bexagizugu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973af072847---raleb.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e19063686---93239599747.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16079016c42bd5---24914416186.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ke2bfteqf4of25vjomvg0lu421/94781719481.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4878bf986---53576648343.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b14bd6e23---65918273183.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/wilalabezonujunodiluvof.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/fimenatet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ferraillage+semelle+filante+pdfPDF 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_off0000b468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB468 15844 bytes
SHA-256: 76403236297d2d060ccf815ae8aec8058f0e33c1897fe42772bfac9933c12872
font_01_sfnt_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 10700 bytes
SHA-256: 2506d0e2f6a196fc865904207bd837a17afbc9f2ef2b19dc03bc36c841db3f3e
font_02_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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