Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7718e107b0ebc3…

MALICIOUS

PDF

70.0 KB Created: 2021-06-29 20:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c93c524db0134d485c730d7c91ee3d8e SHA-1: 468d722850abb764af018458df4cb93824a3385e SHA-256: bf7718e107b0ebc3c4b614cb716cdc50a40ecc6e22323077509c849bc2e91bc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=idr+to+aud PDF link annotation
    • https://contabil-fiscal.ro/mm/file/wasudejet.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d883520d47---gidujujemejinujuranifeke.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/10412887994.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160748142200c4---wovosebovamenewerixeki.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/129270780260be17ec6ce55.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/jikepazelevalajimobejas.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf21c196a46---fawesukiligadagokipuzige.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/zetijazuradoxu.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/lovimevizexitubevobuzuna.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/mabafubilodato.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/nadas.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab0dc85c2f---42822131939.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef05439aa---bafevarigajewosojizopalox.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/86314327974.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/mivufusitos.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d36337a989---melijiwopusozezer.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/efd8de7094727940984c400c64c0bac6/nazexamamawuzaxux.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/1a5f169ab3148e88ea29591fc58c0411/58482181882.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/vorulewudusu.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/12366682385.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/42502341215.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/2196facff0d215f7223363c22a7de392/xiwunulodunadexadi.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e1637516e---49136324849.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/3f869d899b66a5f715c6e042b8c10ccd/fimowaninolu.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_off0000b5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CC 9748 bytes
SHA-256: 2106550bbe04769e1490bc51541047b83e227f111dbff49831fb2a59fd50c453
font_01_sfnt_off0000cb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 15628 bytes
SHA-256: a1cf5c424fddf4a75b2a38fba276629527de4a65cc011f43d5c63a3dafeadd91

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