Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40c89735e930563…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 02:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac7ccc51e0df77ee1d2af9ab1d34ac70 SHA-1: 1a8d0085dea58c536e04555ce8e4dabfa7461781 SHA-256: c40c89735e930563744e345808f0a31f277803a6c659cccad7b15f8774a0a8aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769660af1c3---jejidazoromaj.pdf In PDF document text
    • https://petikdaun.com/contents//files/gowatolotadonudalirasoz.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb3054359---73828022162.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/a48af0e35b8da6934c3e592ab8af578c/52729647005.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/11622923418.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/bdedc754bc81fff8ebccf1de8bd929c5/66244892695.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/65dbe45e39cf2477071294da8ed516b3/tajirijabejogej.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/23cdeda0f2f1bb609755bbe07d8a8af1.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/zasumusawagokumapububupi.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5dc1c0fcf---87536017667.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/zabexigusitije.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/31adf37138360d3b7fa4a99bfb62a4b9/vopezas.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160af97e2d98c6---robimepejifekuzedaxusok.pdfIn PDF document text
    • https://papiratisk.cz/soubory/23263420017.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/52089055917.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/58765349362469a2ee2f0feb05586968/repixifazeseje.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/nifavelaramu.pdfIn PDF document text
    • http://mebco.ru/images/file/joditekatigixuxinoga.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/volivoso.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a2586be920f---lolefirirajidejeruro.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161213c8ec9296---zuwirifatotos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=derivation+of+curved+surface+area+of+frustumPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 20768 bytes
SHA-256: 22db727b53093984b3fd06cbe383bdc67610d4a47780ae2e7e3409ca800d25da
font_01_sfnt_off00010c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 10756 bytes
SHA-256: 78a14cdf62aa5f0dd4a5c1fd32530fca5770945e67fb862ec99bdd36381e3c72
font_02_sfnt_off0001254d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.