Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfa43b9131763fd…

MALICIOUS

PDF

86.8 KB Created: 2021-08-01 17:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ef422735f9ee160b0f14513ddb5aa38 SHA-1: de9743bff81ccd66e72344f493682f8f99c07b9c SHA-256: fcfa43b9131763fd4f436f2de032501675f9cab8c8d3a0746db3571ae35ca5fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aksaaydinlatma.com/img/editor/image/file/70876229117.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/99617497659.pdf
    • http://kpotplace.com/uploads/files/giruzunimijemis.pdf
    • http://asea-admin.com/_userfiles/file/20210603171424.pdf
    • https://sakkestadbil.no/userfiles/file/zigavokilerazukipuvatede.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f3d4b8f97---86107574089.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/tujimazivapovetavuza.pdf
    • http://albarossa.jp/js/upload/files/pipid.pdf
    • http://rotarylaspalmas.orgdocumentos/file/beraxazufapetex.pdf
    • http://abwninemile.com/uploads/files/2647610121.pdf
    • http://learningkey.org/userfiles/68547518365.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940ac21cede---67397834120.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/m3prgegjtmr45khjcgg91temc3/kujupemudawedijimiponexe.pdf
    • https://liniagdanskzydowo.pl/files/wapanubuvon.pdf
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/89488910317.pdf
    • http://phongthuydotho.vn/upload/files/32901892078.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/cf4cfbf05c9158b31d23be22169686a8/vizubuvevura.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/tcbqjcjh1eva8bvg0edlpeht24/69166149565.pdf
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/94016172644.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bec2a0d1e53---pepigol.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/sozolejituk.pdf
    • http://jsdarvin.com/files/59033432677.pdf
    • https://siroyensao.com/upload/files/sugimufipofunavozajube.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078af542832f---kakakuxufug.pdf
    • http://hongshengfish.com/uploadfiles/2021062802585576406.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+destroy+the+ender+dragon+in+minecraft
    • 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_off0000f068.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 16792 bytes
font_01_sfnt_off0001087f.bin
40fb14c1b85f16797642f9a0d73c25b23fe064e5594bbffb0a5dba7126d15ead
pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 11068 bytes
font_02_sfnt_off000121f0.bin
365cd45acda1d37a6dbe6419485173fe9a8a64fe2b0af9494ef83259d0d12df9
pdf-font-stream PDF embedded font (sfnt) at offset 0x121F0 16168 bytes