Malicious PDF — malware analysis report

Static analysis result for SHA-256 74132e8a5f14aacc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 13:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44325d2ff809240e81560274404a1041 SHA-1: 640c7750e9ddb89c7c81cef61e5aca9d4f798511 SHA-256: 74132e8a5f14aaccc8f28d79e1ca9529fa8ca09ea931b6b8db9b8cec2e945c3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chcial.ru/uplcv?utm_term=marry+you+bruno+mars+piano+pdf PDF link annotation
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc33bbc462---86041688308.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1955f9b3---digewewimeba.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210623055838_eew42j.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/5872749293.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895ea1f2f60---damoriso.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/430c32990er21ve7p0dtjbnni3/78400258801.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/punifa.pdfIn PDF document text
    • https://attack.lt/images/files/rukefubomiz.pdfIn PDF document text
    • https://sapporopools.com/contents/files/zudokatonenu.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/92289951190.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/88729101003.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074921d0974b---83096526692.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e37ce7bd0---jinafisutoxodut.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d0a4c428a01b196cc433b0de1a854c2e/48465992285.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/27104346894.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/56108180637.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160924e711efe3---19410732712.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/nasogofasug.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/62946976362.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/3nvepsfguv9ah2p9c1r7tuk0go/81359426800.pdfIn PDF document text
    • http://matras-devison.com/upload/file/74330888368.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/fb8c49babc1b83eea51923d4468d66fc/sutixazimizemuzibovok.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_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 17488 bytes
SHA-256: b0a55aef86a40f1dbe5aa10de74ba56fc3e75aca654afa14b74735e24a387d27
font_01_sfnt_off000100d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D4 10732 bytes
SHA-256: 1f4c6fd188cdadfb89be441e6d99fb12adb0f12b312891c82780e0cec8bf0168
font_02_sfnt_off0001193d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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