Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5478321844787b…

MALICIOUS

PDF

70.3 KB Created: 2021-09-10 11:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b738295a361d24d5ee19d59acc6efc2 SHA-1: e749e7e3e3403ff286540fd988ff9d071343e2a0 SHA-256: eb5478321844787b65274ea23a9d226fc06fe7cdeedbbae3133ee50e57035350
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and a potential phishing or malicious content delivery mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. The document contains numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cjsc.se/ckfinder/userfiles/files/woror.pdf In PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/ximagefajizuvokeb.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/54805415360.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/97906896510.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/likepazapejojetaxogogeza.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/73105632566.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4699832a---lujezabatozesa.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/regodaxigarifavutesimup.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/76232915803.pdfIn PDF document text
    • https://matratva.in/userfiles/file/jemifoturibefo.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/pagovinadexuxu.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/51957078396.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/133008162261319e5aa6ea0.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/12852818894.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356d697172c---bobeguzawijebonur.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/88654436700.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/wipaguwujego.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/sakokepujurevobume.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/wozofevezagemit.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dc1dc612b311292aa26d00cf5225a191/nofitolipixavofax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+android+keyboard+biggerPDF 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_off0000b290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB290 10800 bytes
SHA-256: 6ee745ddd308301249d8bfd51a732adc4b76cea0692ceb95756c20fa30f0c4f7
font_01_sfnt_off0000cb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 15884 bytes
SHA-256: 36e4305ec78295a7d114e3519dab0b828f487eb9ad5b39239ccbc48902216320