Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb28c7aecbea9dc0…

MALICIOUS

PDF

87.3 KB Created: 2021-08-17 06:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 05703cfd2af2af82dbd3cd9bd7c39a05 SHA-1: 20f84c0a6fd71637e997ccfdc4369f4761aac68a SHA-256: fb28c7aecbea9dc09c7ca58b4c3e693fc33b086388c65736e80e69e7d298ec42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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 http://hanasushipickup.com/uploads/files/87999581876.pdf In PDF document text
    • http://n2nlah.org/UserFiles/file/77155595937.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/falokefugor.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071e9204094f---satinobujitaxonus.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/27263520396.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c40d07cb200---wifurekigatutijo.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/be42debd315f97b9aba33e8a7bc0217c/66927422168.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/10313532935.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/gupizusulifol.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fc9e1185e---72024528826.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/42872214158.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/30cfb6865901068e9172ed4765fead3a/93578687934.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210625_EADB5478FB503525.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/xosefowez.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/sowutowulavunusovata.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ac1318067bd8182667c5ac114b1d5785/gasazugagalod.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160bd33f590468---webakokubugef.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202108161947238897.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8c9c3f3df---ranodijof.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/41331338077.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bde703155---70720544313.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083a29c41a4f---junejumofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=plantilla+para+escribir+recto+en+folioPDF 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_off0000db55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 16124 bytes
SHA-256: 9faa3a8ea51b91d085f11c52dd518a68db7adad6d755269e2d90a5148182d4ed
font_02_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 17152 bytes
SHA-256: 4f7d2b2f2dd50bcb4cf58635314da3e1545bf36931da3ca64d39d37966b3f1ff
font_03_sfnt_off0001345e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 10616 bytes
SHA-256: 99b35ac8fdaddefbc2af74ee8e8879e58115c67a15e61d3fc48f14a0fe726871

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