Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eab94c88cc162d9…

MALICIOUS

PDF

87.4 KB Created: 2021-09-05 05:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb2148a2280bafcf3cc7cbe345ccaf0c SHA-1: f06c5c94dc6ac6cbd33a3368b636a8bf488d749a SHA-256: 9eab94c88cc162d9351d099474e41f6e19ff386e20eff7205ea8e35f93cbf201
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF link farm indicators suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://camberwelltaxi.com/survey/userfiles/files/dijagik.pdf In PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/957bc44a862aca0fe36bedcf69dec157/bodajizop.pdfIn PDF document text
    • https://samowar.me/userfiles/files/jedilufevuri.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/juratod.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/lisurujupanarum.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f09f8fc9250---4621021240.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/78182230543.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/37953994160.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/9771147666.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609daea3ba792---84973807609.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079479bb24a3---kinukagis.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/rabaxonexoxotorebetimojut.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/46649985638.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/f8238valusf64ctks1qkp0j463/25735372982.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/vewokemevupapiritajas.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/39589452371.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/36017527452.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d545f17f07---kojenikikipemifabuzonix.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b8e10678e09433a13d931c43934f1cd9/76001208432.pdfIn PDF document text
    • http://isvpro.com/custom/files/sutuxamukadajeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pyramid+principle+minto+pdfPDF 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_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 10728 bytes
SHA-256: 45d0db0bea5edd4c42730b28a152b3b08a770b26e3c5d58387bec6aa8471b366
font_02_sfnt_off00011ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 20576 bytes
SHA-256: c90888e0bda11a83f126f5be715d2721268c8c5d58f543d91043720e44bacd70