Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5808e4549e3899…

MALICIOUS

PDF

72.9 KB Created: 2021-09-19 01:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05cf27dda083eeb9c31b32781fcfdb62 SHA-1: 6a3fd153f51853cb507b2531bdea015f1b54ea75 SHA-256: 0a5808e4549e3899c6a87c5642f4b8399bd4a32db11a4659d1d0a20d43292b0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://naszymsladem.pl/upload/file/11732652008.pdf In PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/begosutigog.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/49471409169.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/nonomofifimobijosajo.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/50375223329.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132f40b0ac32---fezojasolijelenisokejijiv.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/fu5qpq0jauipkeuqceh8ft632e/61930945169.pdfIn PDF document text
    • http://aven.su/userfiles/file/sajazojena.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/zusaset.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/jutofasepikafixotesoj.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/vezuvesutone.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/misur.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/26859861121.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/11734832623.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/govupodu.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/zalovixunojinafutatoti.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/gowilobobomuvovatijivut.pdfIn PDF document text
    • https://podimercrm.com/img/files/75809645944.pdfIn PDF document text
    • http://lukinserv.hu/file/55382981145.pdfIn PDF document text
    • https://ms02bet.net/contents/files/rutugodatapaseranimuv.pdfIn PDF document text
    • https://duvanco.be/docs/files/34948025788.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8882ac2c---duvodiwikezav.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/lewafa.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/50975344175.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d470bcb5b7e0e439dfa5d6bb31b9dbcc/wukowe.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141150894bb7---xirevutipifiwuloweloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=grounded+theory+thematic+analysisPDF 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_off0000bc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC53 15748 bytes
SHA-256: b4381c2cff00d92545da29d09b46fa4679220b15e1fceb907c90c9713cd6d76f
font_01_sfnt_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 10888 bytes
SHA-256: 38e4aed4900f55e6b60a90e1ddfa2482b8d944c83c3a408f2f274114cd0dbb9c
font_02_sfnt_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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