Malicious PDF — malware analysis report

Static analysis result for SHA-256 4033ff1f9c832b86…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 14:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce98685c4707a342be75f28e6a0d32a7 SHA-1: c905c95af9ec5529ae9dcfb832e60a86b24b6cff SHA-256: 4033ff1f9c832b86b59ce3c26aa541bcd02d9d206b5ce71ff746598d86c084b6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ccaa2efa3fc813404099d51418750cc2/65070202873.pdf In PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/zadekibunaxolibefesazu.pdfIn PDF document text
    • https://red-adlay.com/upload/files/ruzemita.pdfIn PDF document text
    • https://mollis.rs//files/rikoz.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/90182970795.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/rukazefizizoxitopudixaxow.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/balirivelobutifoxixu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a803da127ba---66309449303.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096baa652771---86530779492.pdfPDF link annotation
    • http://lblussana.it/images/file/58460895646.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/50781621802.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/julitarorinada.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/qlcdvmc6e56adnjv1pa0sqqecj/31238734513.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/73114548851.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecc2e4bfda---mufasojisodotapijijas.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac216564c6---zazubizemuxojam.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/jojujor.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d93d9d02f9---napenarogan.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/72020198593.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/61790111011.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/fadazasesuwufopexoxiso.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202108131814373571.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/govifoxukawuvimetid.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2s099olkvibmb3rsocrqqd8rpk/maxurapixaxotufop.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/02630321401e738ee6eecd3b2bdf663b/jadutolozolipobufut.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/70611952513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=to+entice+someonePDF 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_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 20364 bytes
SHA-256: 267545875c623075531c934289021928c8c8889f8d2f47f8249fdfdfb0117240
font_01_sfnt_off00011bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F6 10044 bytes
SHA-256: cdaa98e049c49d3a540de7d9a86be1205961896e683a78b74a0f917e24b3ce76