Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5e6a21cb8ce061…

MALICIOUS

PDF

89.4 KB Created: 2021-07-28 09:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77da539de7249f90740d3c06ea014da9 SHA-1: c31950a1933fa54698fc173ec7ec772abb8fd470 SHA-256: cc5e6a21cb8ce06106da4f6591cec4f825cfb5d1ff8690252e12a722e6980773
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious document used to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c52000bbe---68786731094.pdf In PDF document text
    • http://boxethai38.com/upload/file/gafufozeti.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/5r0bg076rva8i16lhpiend5m87/36755698832.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/56413372136.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210524030742130.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/76643620985.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/57937463942.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160efeaa8b6b78---pegiko.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8a354689d00abf32576f4d479c141543/dosudekumowuvezurunofok.pdfIn PDF document text
    • http://wenxuezj.com/images/File/99067393157.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc85bd45d3e---zomagiraturetarumo.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/42546337176.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/simozitibinezevakuwu.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/jinomuvavejewiga.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/b8ete7hv76dmeu0lgoeruobkl1/67248865055.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210617021159.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/65836413917.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaafa079a8---62306649991.pdfIn PDF document text
    • https://bczenekar.hu/files/file/50370123300.pdfIn PDF document text
    • https://codecs.ro/images/file/vujejolisariwosaduni.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57df3e33c---55028914862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=naruto+shippuden+ultimate+ninja+storm+4+ps4+all+charactersPDF 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_off0000ed54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 11064 bytes
SHA-256: 755132b710b45f6e3c9350cfde59c97a5280c22c92af36c25da82fbdaf53d77f
font_01_sfnt_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 1680 bytes
SHA-256: 0b27872ee3387f632ffa0f51774877cbc2e0916f916e7d27972742c12f61baa7
font_02_sfnt_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 18116 bytes
SHA-256: 3582bd260a38897e44271b8e5a2b3d8207b0263db906d2a6487cf6a46cc84737
font_03_sfnt_off00013e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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