Malicious PDF — malware analysis report

Static analysis result for SHA-256 940572813d168838…

MALICIOUS

PDF

87.5 KB Created: 2021-09-19 19:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 276c60c9316159cacaaece29f6c13603 SHA-1: de52f11d18539e9f959b83e6ea5dab1c36bc3043 SHA-256: 940572813d168838cdc630fd89fda3446bed731b53fb4a984cf2671da9449af1
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URIs and link farm indicators points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://swissies.lt/ckfinder/userfiles/files/mewirizabusapaxojaxuzosi.pdf In PDF document text
    • https://garnet-medical.com/userfiles/files/tapewelaruzonizo.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/74292307710.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/67087328932.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144914df2775---jagemu.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/jijabutapelogubi.pdfIn PDF document text
    • http://myphamasia.net/upload/files/90939201221.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/17638821490.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/daxowadegesinorat.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/zopij.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/73104602408.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109130220272823.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/66581090310.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/zupojalifebimaj.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/71d00d7941a6340381708befcb227bfc/9781918880.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/tubamunivax.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/53412221769.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132b434979f2---nisajifivowole.pdfIn PDF document text
    • https://agros.net/uploads/file/wejudupunogatozexex.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/72904530395.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/davuxiwufukimekaxawefalad.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/9559954677ddf4d8dc05e2561ed0a868/51919533054.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/60436654947.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/zivefegulanumajelawef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=install+hbo+max+on+firestickPDF 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_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 10884 bytes
SHA-256: 5e9f071968fe3cc28d7783c65dd4a75a724b568faee68f2efc26d973fcafe0bc
font_02_sfnt_off000121c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 17960 bytes
SHA-256: 53531da00a3bb9937c1bf9dfc6e5dadd615f96c0581ec6ce7b44227455181c59