Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33d1e7a3cc9374a…

MALICIOUS

PDF

92.7 KB Created: 2021-08-14 03:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 29c2d846a218b6d79ebb08e4e6a0686f SHA-1: 42d43de311bdfa876c54f1ce77544c9189ee29e9 SHA-256: a33d1e7a3cc9374a84fd537efac11622408d76041dc4dd7c53e88cbfe9558e56
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary function appearing to be directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://crewmak.ru/uplcv?utm_term=how+to+hack+mini+militia+with+lucky+patcher+2020 PDF link annotation
    • http://mega-treid.com/userfiles/files/97623867179.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/402b110ecfcc6e28f80d9c84ca0e81dd/sofikuwadaxu.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1001d8e3c8---gajawal.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfafed99988---savoz.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/020ea79b87adddd61aaaf792473e3775/61912682420.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nomujudos.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/96915796320.pdfIn PDF document text
    • https://morabia.fi/images/file/kipevopitomoropeduk.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/jimonekazinunanixin.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/pvon9apvmj6a86fk2uqv14sbfj/49984198067.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/rolitotidosanikojofok.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/xuwarewedigiwoboboda.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608958bbbb8db---kozomupap.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/76545472552.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac34a254e10---sudevepavinowuras.pdfIn PDF document text
    • http://hongdacable.com/d/files/13112725551.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f116ccc08cdf60c31d92b43373dc9b9/81668067048.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/763dde5a7da4f16440755a8f317fe25b/73267608618.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/i1qkoo1td7e0gesr970ps73433/zitun.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/gomowawanabujetaremezeso.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5b28931820b60a4e12301564e2f51942/ratudijepuxogen.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/92302840258.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/obkg36ed99rmo0lcb8holnsk6c/49895121024.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/vikusaxonit.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 11096 bytes
SHA-256: e36623eb73520e4b4a0e07c4d9fcc578f2e5bd07a147f00492ed101ef424617d
font_01_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 17300 bytes
SHA-256: fde79e35eb87652da27a71ced9d8726b53433b867dd37b52e8f4ea16e6346e1c
font_02_sfnt_off00013629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3A 16228 bytes
SHA-256: 81a4c831029f374bdddbc898cef759a4ffb5e94030072cf4cdb9fd6c34dbc6eb

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