Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9a8b038dc57782…

MALICIOUS

PDF

73.3 KB Created: 2021-09-12 14:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db0e37727d2b547e261ad465f2196eeb SHA-1: 4adc0c6e8c0c84d5e4031a733d3f8e6a3aff9228 SHA-256: de9a8b038dc57782aad2ea9e1bff303f1e9b0cc6fb54e9c2a7bfc8a60e872b67
156 Risk Score

Malware Insights

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

The PDF contains a link farm that points to multiple distinct hosts, many of which appear to be compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL targets suggest the primary goal is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161342ffc62980---jedovuvita.pdf In PDF document text
    • https://telorgabus.com/contents/files/37181589749.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/9167136647.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/mubuxekaragifezixaweso.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/7252447411.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/32170745913.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/jipolaguwivevosu.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/20057776418.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/belasuzifoxuwozapuwiriz.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/30869210374.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/24347742990.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/21145241999.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/523570cf0f0a9396df030d66b660f703/lebabiloxopazulul.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/42544818631.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/bawegalijesekimumuwegep.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/40411396388.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/654efc7887bc391aed516b4396775afa/viwukekakenivanenowawo.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/luvimaruz.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/pugaporamoribes.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/nuvukuwiwigomedevazul.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/murexipi.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/80176340440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+google+pay+for+android+appsPDF 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_off0000b8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B6 17716 bytes
SHA-256: e5213d00dedc5b98e660cd57f4d533817d71513584b05f08f01a9632d3fbdf5e
font_01_sfnt_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 10764 bytes
SHA-256: 9cbf23e8f7fb513a6210db1d149d494d0dfba5945e0b0b973aeca5cf95e54563