Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c4eb573b35e0f1…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 01:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a2cea847e439e45023599a9c15442116 SHA-1: 87a81f903086973d4b6e6fe17803c51ae3b49b7e SHA-256: e7c4eb573b35e0f129f15c93909372722c5c40a9908809f5041acf31fcffdef3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6991

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://aslimitada.com/userfiles/file/moxeser.pdf In PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/84a3ca443f26ce517a0448b4457034d1/91380741512.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/japedunonudo.pdfIn PDF document text
    • https://penzion-palice.cz/content/gebajilug.pdfIn PDF document text
    • https://kuepancong.com/contents//files/22876670431.pdfIn PDF document text
    • https://medtek.vn/storage/file/torafumuli.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/jejoxevoku.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d60ff6c6a5d---11708396743.pdfIn PDF document text
    • http://dmkert.hu/files/file/dodemag.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/66700347713.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/bfe244c1d4c3540c523c73ab8b39d41f/zisopekawotijek.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/96003225045.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/43253695043.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e12fd4af0c37a375bce4bd5a46aad82d/32972988670.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607649981a8bc---60121129856.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/28678992982.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/risumunetotefedil.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7acfabbb5---dasedesopalati.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/farevazolilawazojoniko.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/50905421247.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/revadar.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/disemonugopotukufudale.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/49711483212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=project+mobilisation+plan+pdfPDF link annotation
    • 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_off0000d7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AB 11052 bytes
SHA-256: 2e905f7ebbe21ee8cc3d2076756de862aba814c1d0ee90abc3a07f058061e7ff
font_01_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 15888 bytes
SHA-256: ad1c8ab3ac4fbc8e7f1ce48c94c14c23ee5af9e1b790459fe2803dac4b9c1a44