Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed2539e88df2b2a…

MALICIOUS

PDF

85.6 KB Created: 2021-09-12 16:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fea3c7f728ad699e6c3cc68df14e28ff SHA-1: 9b0be83ac91cc5f52b1d22d0c8b29c987a81f195 SHA-256: 9ed2539e88df2b2a500ef25b316eb7ff692ea57401ccf6a9545efcef6fb5f484
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely to redirect users to phishing sites or malware downloaders. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://datajournonepal.org/files/89064578902.pdf In PDF document text
    • https://computerzone.pk/file/66932749188.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8f7529157---kotelatewalidizagexa.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/55962880819.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/11700488360.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/25320322523.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/58488215999.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/jedubaz.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5a58c7d583b1461fe6e2435cb32e827e/finuno.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/fimobifogeberivokemi.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/tudavupir.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/2576876235.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/lebalizeju.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/xilapodejufibixagelun.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/68e1hdrb1o48b4m4883cactr33/60098842128.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/96004422698.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/92901635024.pdfIn PDF document text
    • http://domplus.su/userfiles/files/46531652984.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/sifomeluwiduzokiv.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/buposesujupigugit.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/tobajaxufikig.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/64041900456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+basic+unit+of+memory+isPDF 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_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 10872 bytes
SHA-256: bbbebc2df00b740dcf3fe8dafbbbb1953c209c041271d38b368e205a6099ee68
font_02_sfnt_off00011a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8B 17800 bytes
SHA-256: 81764aea7b263a2d425aee2fa40a91a55d11db58490262b4360cabcdea8da5b9