Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab2e5266b6bc53c…

MALICIOUS

PDF

84.0 KB Created: 2021-06-26 21:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 63f718b35f056e23bf5ff08919ee3321 SHA-1: 25c055d51a60d641d74f06d0eb02e808293592b1 SHA-256: 4ab2e5266b6bc53ce7e4efa2a79b6a95556d5e29c55596f918bc45680146c2a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c213130d18682aa3959e79b83173f3a3/932742237.pdf In PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/muuf3f264v22kftlgkqfjqnbfh/tamifupuwesod.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/zerepofinoge.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/xorujot.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jcemqi4r8hhta98bmvpd8a0l59/tivuzoxejiwarejukex.pdfIn PDF document text
    • https://okazionche.com/files/61198246562.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/88221091733.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094147ac6a69---fasegu.pdfIn PDF document text
    • http://goref.ru/files/file/88050397476.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/kufowiburasonaze.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a954d8890f---22442499988.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4sm6440qk3fslitmji4jn5mttf/wabagiwulukaxivodokotafix.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081af8100210---20178547046.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/60837961056.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e21d70496---nipuzapu.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/64612256374.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ev7k71b8fr74pbpo9jemsmj5h1/40198624170.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/70484152663.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c7de6836a---teguxi.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/tejusezevolumolanofalule.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2af6d3eb90070ded9393a7843016e969/vuterufogemunagiwekurul.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lds9e3s5d5td123psn1dg7kdj1/91767762534.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f56645b0d---lonixaf.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/4633467913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gate+2014+mechanical+question+paperPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2275798cd56810d06b779603ce27c052/86579876811.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_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 11296 bytes
SHA-256: bd84ea7dac86fb759e47517e4f2b5e48ff1653cdc1780f8c0b1d2ab24406fcb8
font_02_sfnt_off000113c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 17208 bytes
SHA-256: fa6691b2fecabf1026b99686ed5958f77a9a8fc3187c69931861ecbd7b4e9119