Malicious PDF — malware analysis report

Static analysis result for SHA-256 800cd3324c510fb1…

MALICIOUS

PDF

94.6 KB Created: 2021-06-26 01:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 33c7a7de9aa93d27a3699bfbd87f4c7d SHA-1: ae02fdbf56620a14e0e3832387d542b5d989bf8f SHA-256: 800cd3324c510fb1698df65d667597a112c95010b10b6769afa5d1900ba37e0e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs indicate an attempt to distribute traffic and potentially obscure the final destination, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://cambresisemploi.fr/ckfinder/userfiles/files/fuvepedefub.pdf In PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/65125616664.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da0e6675e9.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/q5dfm0q7anct4l2kubn9h3ehgr/77177476385.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b06d0f95a9e---65525583512.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/47764608109.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac4dbaad9---12438101143.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d99314e31---9504375805.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/5566666112.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743a2d0146c---88677415793.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/fobizuruponanuborimudiweb.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097ffdd24f79---20462841824.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fe9c0b15826aa3068f60b94099a1e4c6/parutuserovotexebuloniv.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/korg46clketic5fesmbo3khufo/43804304750.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a187a89b1f---313614080.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1217e00ccd---zubitutudilabed.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926e323504c---59878170106.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/36867357434.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a6bbdc5714ef28eee2fec152c00f8e63/nikubifidewuworuwe.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b71694d06---vekatusipunujufujavexef.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890cd0d7466---zoxugabatupitasebo.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946563a3e1d---62657194807.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a08c2191---dasawujesuzenafunixadolo.pdfIn PDF document text
    • https://rosycaffe.com/file/61049210772.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/0cff3286e4823b31a4a14b0e1f0c6fd5/notutezuwoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=rate+of+disappearance+formulaPDF 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_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 17920 bytes
SHA-256: 7347dce7b6f4ef6c26efd90a25d366a0fb6b94c5575eb42cc953768df02685c5
font_01_sfnt_off00013bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153CC 10928 bytes
SHA-256: cc92f0b3327e7ca65eaa54f9492024c5eaf796bb02e90bca6f6a8e3a4995aac3