Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcc159e72296189…

MALICIOUS

PDF

89.5 KB Created: 2021-07-08 11:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6c46f214e22fd092c83f5b9737acb18 SHA-1: 5466bb1d70494b33292553c3e68890407312ea8a SHA-256: adcc159e7229618993b6dca6c42b59101fa57f4ba852a6722ac311b5e3a1a7b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised WordPress uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cosonhuath.com/hinhanh_fckeditor/file/rizojiriwep.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609d32d5ad6b0---84524580986.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gorivunawujolapagudines.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/oe1045mlu2fnbn47ct42k98hrn/55754914254.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/3c511bddf8263b812729b7702dd68bf8/40301751633.pdf
    • http://hotelrealerimini.it/userfiles/files/13776419787.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/efkd28359r1hueik37i3i5ump2/12475780010.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ef518be56fa3d45ddfc81fec4bd721db/28231560576.pdf
    • http://fitviewer.biz/files/file/xituxenuwoxomadak.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2381a4ff4122c7c2fd65dcb3be4d3343/40835017289.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/sliigt7utu0h09d9pn1l7k8v19/gojojiwodegu.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/73177405183.pdf
    • http://daivupaint.com/img-chamthi/files/97215066328.pdf
    • http://nguyenthaotech.com/upload/files/62818252854.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/ea07bddd1082cdf6af1d8e46576982d5/xexuwepojuz.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/633a9e345f9f85468a89d9ae8c1e7399/luxefosizolinin.pdf
    • http://barnesfamilyre-union.com/clients/52050/File/vizazebipobinonorumob.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/0d469031d212fd19077bbaf1497e5be1/96702130526.pdf
    • https://trimix.bg/UserFiles/File/48132668176.pdf
    • https://fallsplat.se/file/11044872697.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/5908614739.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ab41q28dcjmjbs2tr0itbns78v/31532911414.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/6fpndmhccta95qs9v500fqnidi/7029233274.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/po40nqs1em75mjv9otvcmlign0/sekejoketudezorisa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=suppression+of+dissent
    • 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_off0000fccb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 16792 bytes
font_01_sfnt_off000114dd.bin
42887af19b8ac5e9f06563c6c6772f0bada8af5a1b6d4f333e0fb45c5e30f591
pdf-font-stream PDF embedded font (sfnt) at offset 0x114DD 16864 bytes
font_02_sfnt_off000140d8.bin
d6af8c89692076b1319330ece6605293bac1a9c397b728910d04d35c8c031a39
pdf-font-stream PDF embedded font (sfnt) at offset 0x140D8 10460 bytes