Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed0870534afac8a…

MALICIOUS

PDF

72.5 KB Created: 2021-09-05 02:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b16d59ec157934a082c011825e9c5c7e SHA-1: d476bd6dbc4b5486a28750ec5c426eb93959e942 SHA-256: aed0870534afac8ac4f3f295151fdf2b42522fcbc717b7c9e9c2255be2ce11ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. Heuristics indicate this is a link farm, likely intended to lure users to malicious sites for phishing or malware downloads. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cfd2d0a56---74690334576.pdf
    • https://fanaf.com/article_ressources/file/wifubulexesewusuxakoruju.pdf
    • https://medtek.vn/storage/file/13922346968.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/84169654bd69fe4a02623b53ca9a9382/84141227925.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6h2a0ofs3ob57rk5in5oe6ab9t/gurudofaxesatekor.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebba4c4eed---fapiwejiwavilajojune.pdf
    • http://cgemfoco.com.br/ckfinder/userfiles/files/votetojosiwovodaw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc3e826c8---86250541634.pdf
    • https://pnp-studio.com/fckeditorfiles/file/jolofisimilopataxuwera.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a647209c6b1---59096363738.pdf
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/gukubo.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/xitaxelamuraron.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160843ff43acae---dudejapunaziwisofetoxez.pdf
    • https://4of100churchstreet.com/assets/media/files/dofalokenewitefezowadiket.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ca+cervix+staging+figo+pdf
    • 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_off0000b47b.bin
257e9719c80bdeb3e46f85ff0a3621a3d5075a8f24da042df821786012cd488d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB47B 10948 bytes
font_01_sfnt_off0000cdda.bin
0dc843a7efc1e8a47fd79567521dc11771d527f2b81feffa4d9cd653362a837c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDA 17872 bytes
font_02_sfnt_off0000fbd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 16792 bytes

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