Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3aacf1f1b3278b6…

MALICIOUS

PDF

80.8 KB Created: 2021-09-23 07:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cddf1b6c82d8990a979d290cf71cd928 SHA-1: 8dbc6dc9a70b76ad8c1d1193973cb422f5e80e5c SHA-256: a3aacf1f1b3278b6c8134a828327fc8bf106ef1d8bc23d151f91d335819e3bd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hbisan.com/userfiles/file/busuzemolupenusef.pdf In PDF document text
    • http://eternaseguros.net/files/files/zabot.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/q3k59e24sqf9ki8e91a115hr3i/43407908036.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/tojexega.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/99594163659.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/53480409296.pdfIn PDF document text
    • https://kaparatt.com/images/File/tobabodugawugeriruza.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/puwijozulena.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/56463629819.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/76726210052.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/m3pqq5in2ll1borafi9k2ma5v7/24714749570.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/dolositerazarilajajig.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/gowobenemida.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1eb6f20c---wizowetofomof.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/18804000190.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/pagasasetexivej.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/begemus.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/kalemedobuvufuro.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109071454319756.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/nugudidolexaxivimisosiki.pdfIn PDF document text
    • http://195exim.com/datas/files/93287157423.pdfIn PDF document text
    • http://blueyee.com/upload/file/18040010959.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/39292169812.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/14b679b8f12a264824194e4ae87b5886/1291076067.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/87004895878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=external+structure+of+rootPDF 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_off0000dbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBD 10420 bytes
SHA-256: c3bc792fbe318151c304c4139f454037c32fbf41f53d44f9198bb104c1c1938b
font_01_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 16220 bytes
SHA-256: d933c36b6a6ae496f7137af0e449de0ce22d94677447e7948e29c4ff8ba61484
font_02_sfnt_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.