Malicious PDF — malware analysis report

Static analysis result for SHA-256 386554fbadb50cd9…

MALICIOUS

PDF

81.8 KB Created: 2021-06-25 13:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e2a6ee9d605af92977ce69e6233a6d7 SHA-1: 36fce424e0dd6e9c13e495ce81eed14e6d868d14 SHA-256: 386554fbadb50cd9265975109daf01149ef8047992a6f5d34d394da63e0d4605
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains that appear to be compromised or disposable, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

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://annassteen.com/ckfinder/userfiles/files/40774729102.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1418bbf8c4---fabubata.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/c2pv6off312sp50fclgentb639/52219276551.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c2357f8b1---66215193115.pdf
    • http://allycatering.com/userfiles/lojezagawalajopepulileka.pdf
    • http://marthomaiticherukole.com/userfiles/file/zedolipirepuwebosasoke.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e41edd2856---lunuwozegu.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/maliromabolidowi.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ga6939713dkaortdmfp6lhq06q/bixet.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/fkme44ph6rmg4fcigb5rtk4969/29619415319.pdf
    • http://matstravel.ru/userfiles/file/niwatoligupasisiritipow.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b89de9ebe7d---pekawurexosid.pdf
    • http://kme-kme.cz/files/file/70529555536.pdf
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/mipabigurawewe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=7th+house+in+astrology+by+date+of+birth
    • 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_off0000de9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 16792 bytes
font_01_sfnt_off0000f6ad.bin
766e099dc22c5caea562690f6378b872d5e58a5e3ff56f784bccfb81f3830511		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 16484 bytes
font_02_sfnt_off00012191.bin
58ed15bc585cdef74ec29943ecf231171300eb92ec9f41d96557169615a767a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 10940 bytes

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