Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0407a48c2d024ff…

MALICIOUS

PDF

79.7 KB Created: 2021-10-12 10:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dd1d897457d89d7dcfb4956e26ab866c SHA-1: 73bac0df32df792b38a44029a036c1abf012457f SHA-256: d0407a48c2d024ff0c5e196fa5881523d5414667d2cae99639bead2c4e7aeef1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://crewmak.ru/uplcv?utm_term=acute+angle+protractor PDF link annotation
    • http://noithatmfc.com/media/ftp/file/pegemelolosipemaxodabiki.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/jutufuropizuregutop.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/lapinixivaj.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/4196384634.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/98537616945.pdfIn PDF document text
    • http://skisun.it/userfiles/files/jiteritezagosusuriporumi.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/wumilujebuduwarewup.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/gajiwonid.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/53332410725.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/2411606039.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/2786622679.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/38309239373.pdfIn PDF document text
    • http://vhktn.at/images/content/files/soweligokuwe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132388ff14a6.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/gogomopetanitixi.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/43011167525.pdfIn PDF document text
    • http://kmsenior.org/file/files/59861270498.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4158cb92e6c91e9f12b356b62047528f/18851725478.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/77604858982.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/gawibuka.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/vifogos.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/47752642413.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021092223135893.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/c987af5af52fc9b2b399da0e85ae14d4/83223089827.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614dcf148f5aa---vumurijus.pdfIn PDF document text
    • 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_off0000cde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE3 19684 bytes
SHA-256: 70677febbf3a2389f0623fe28947b5edd18a9caf6271a94112b660df663745ec
font_01_sfnt_off0001018e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 10372 bytes
SHA-256: a4f03d4902c1f2e7652278b025636d84e2920da209a843241a79dcd49b58a96c
font_02_sfnt_off0001192e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1