Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcd00627dace0fa…

MALICIOUS

PDF

88.5 KB Created: 2021-07-29 15:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c6eda9fe5570841505bedc8c07e49851 SHA-1: 4de89a5ef71b3f9de6ef29bd59b57188c5925504 SHA-256: 3dcd00627dace0fab2d91328658a38571306b941370d36c7bbebb118b05b7288
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites. This technique is often used for SEO poisoning to lure victims or as part of a phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/rv46hs4e8i2bpc99ju6oaf5gfo/42995996673.pdf In PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d51cfed2780---kerijafarovazovimigixusuz.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/46252787093.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d62e28bc707730ec2d7ed5dea743176f/povatasofidemip.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/odr14i4f7r3ek6ek6ddr5d56kq/71015643872.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/tujajow.pdfIn PDF document text
    • https://digireg.cn/upload/gekuximexegoxexumevet.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/27bc2b783b798008b2c6c460e2949188/17692055339.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607689b09ef7f---pimunomuzuxabubuvixef.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/89779407597.pdfIn PDF document text
    • http://jp-cable.com/d/files/wajewaleta.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe56abb35---78204631935.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/xusuvisarukonojive.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/7944627682.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080caa961bcc---96542919371.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d17dd9d37---86496239431.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/21363128115.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/hpq43r4kejvi33il2s7h36rvs9/vozavu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/gomugebivalujumobefo.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/pifoxoxomopavitoxanok.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdc14b42bf---botaj.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/201fdadc840e700a16d6230541d06e02/35512440746.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/d3e93edaadabb7ec92348bfe1d81bf6a/tobigedipadixexedawemek.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210611031556.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dbef68cda---pamudorunimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=drastic+ds+emulator+2.3.0.2a+apk+full+crackedPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 18368 bytes
SHA-256: d2835467345cad079b8d107141aede934714e233f77bcd990909ad567d5fadd8
font_01_sfnt_off000117fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FC 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_02_sfnt_off00012005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 11352 bytes
SHA-256: b10a9132e02e225ac66d7063a5736dfa5f418a392b50f1d6c1d0410c642bb9d8
font_03_sfnt_off00013ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1