Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5217ce2cc6c0f0…

MALICIOUS

PDF

102.7 KB Created: 2021-06-27 22:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10929329c50cd3542f510f08f045cdad SHA-1: 4f7dae2aed9e7da1d880b6966931765fbe1e9d36 SHA-256: 1c5217ce2cc6c0f0997684293d9a1a9fdb20d0c03663a90e9803c7ec6f6ad874
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://ciskmv.com/css/file/76616957408.pdf
    • http://skyline1968.com/clients/74864/File/8822649398.pdf
    • http://hasici-pristroje-eshop.cz/files/file/zebotekonoloroxigudaxu.pdf
    • http://jshtextile.com/UserFiles/file///34476401271.pdf
    • http://high-keenltd.com/userfiles/file/jigimewifafemudefit.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/tsblrhhhassfmebjudp29chdm5/kumorotiba.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b30ea56790---17586901796.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a112de7f74---xitokanobewujurarap.pdf
    • http://falconartistmanagement.com/ckfinder/userfiles/files/momujo.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/r2oudsddngkt6rk86h9v4dl6jk/1889393361.pdf
    • http://www.rotudavid.com/ckfinder/userfiles/files/5805280947.pdf
    • https://advantagelic.com/singhania/downloads/file/rubexove.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cac8adb458---liwugogubiju.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e20cfae8b1---91008454735.pdf
    • http://cablexconsulting.com/Upload/file/37209647347.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085e07ca0b96---xisusatonatavoga.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae4b2b163---buramosik.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeacf8d7c9---97694236780.pdf
    • https://cncunse.com/d/files/53143818527.pdf
    • https://bouwservicewinthagen.nl/userfiles/image/file/41624518691.pdf
    • http://china-engine.net/ckfinder/userfiles/files/moseluron.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbece43100---zewubakusoto.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adad6fe9c61---roxokogodupuxufubaj.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/fujubase.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/b377f000c67f1d3be8def7d93e7d2376/gavedonujoveromeri.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e6d0efeae---pibemagu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=local+indigenous+groups
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1F 16792 bytes
font_01_sfnt_off00014636.bin
5ab1ff3dfb93a8029806f808bf85d5a9105750f55ba9733e4d378e5af2cad047
pdf-font-stream PDF embedded font (sfnt) at offset 0x14636 10648 bytes
font_02_sfnt_off00015e6e.bin
dd9a8c6c49439e59e22831b186d78127b2c30f727eb4fa47b59551a073a43391
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E6E 18136 bytes