Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8d9d5c91726c68…

MALICIOUS

PDF

90.4 KB Created: 2021-09-03 17:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca19e0e5be09679df34dfb9790bc30be SHA-1: d204682ac57eaf31bf535fa0b734e14261a9a776 SHA-256: 4e8d9d5c91726c686e28d27ea5e01095315a1542275327d42a5e4a5874f830d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ipmarketing.net/userfiles/file/getukuzevives.pdf In PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086e1e36cafb---kizuguloxetukixi.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2650d1caf---34369833463.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16123542925fdb---4724020218.pdfIn PDF document text
    • https://eventaipei.com/upload/files/bagedadotanigisuvide.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/60292679790.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/8c8095483a64eae00bbdb9539e08bcee/gafemafuwave.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/4244e1f7869b84177413f27dd88807b6/janug.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825d5766214---72220178823.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/ramefojupomo.pdfIn PDF document text
    • http://yuha.be/_files/file/13925236666.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075063bdc147---gijipegulinawokoliba.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/pasokodawikixosev.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-8-17/20210817174443787364.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/98580467540.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210704_15FA523A30B15A88.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607259862c626---kevitinepivujazufi.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/xutimilolulitobofapasawag.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/kidamuxovelovipopuwisixa.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/158a97976eba58ec9d00959d24d7bd5a/wujumivuzapilubeguped.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/90604258229.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/42378033557.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/mijilavowigidil.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/7382783313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=best+pdf+reader+for+macPDF 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_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 17700 bytes
SHA-256: e1d47a40b55bbf2fe79dd8676815fff605832926b805fb74db33068cdd7b3ceb
font_01_sfnt_off00012b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001434e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434E 10592 bytes
SHA-256: d73d8ac866eaffc275cf619a097568d174afdb431207d12b99a36281369a3e3a