Malicious PDF — malware analysis report

Static analysis result for SHA-256 9886857aa6fcaee8…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 20:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a63e774778013365f38e94d5cb2b3398 SHA-1: 46969454d91386dd0b9e035a04f0b721b750c930 SHA-256: 9886857aa6fcaee8734a4ed430da8a29ffd2edf0d6cf2e6b862574503556b09e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on compromised or disposable domains. These links likely serve as lures to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=doom+3+resurrection+of+evil+android PDF link annotation
    • https://netwindowvn.com/uploads/userfiles/file/29442651407.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/fununutarefetufa.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/minopisikexebi.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/vigeb.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/fetel.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/jaxorovizidibugedewetosuz.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/27366849762.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/49599381933.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/wesuzema.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/pitirepup.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614769df1518c---xesumovilakokani.pdfIn PDF document text
    • http://renknh.com/ckupload/files/3704209812.pdfIn PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/bixuxosexere.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/sebegapis.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/sorazofiv.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/zubenarixisojazivi.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/fezubenidelodukuselaxe.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/gapekutose.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8037f85c---sepixa.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e910435153---kamilomamajesabikofosir.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210917155022124.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/93270523185.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/gifibinakimutijage.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613280af197bc---97166890781.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/32000012753.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB0 18652 bytes
SHA-256: 8c74b0a91436873d5bc19bf546d24402cf5245f509ac917f6dbf6ca380c524df
font_01_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 10976 bytes
SHA-256: 1fa0aee2bb4c7f8d1ea9cc84ba02a913567cfe5b0bb677c76669717985477d06

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