Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9f6a52dcfaa41e…

MALICIOUS

PDF

93.2 KB Created: 2021-08-04 12:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c27ae038af62a8c2e35553dcce22a66f SHA-1: b0867218d80b1619ca7a685a333279eba936e871 SHA-256: 7c9f6a52dcfaa41e7cd876d5ca92f4f6bce8cced9a2f1297a969a9f0ff2ae351
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of PDF link farm heuristics indicates an attempt to obscure the true destination or spread malicious links across multiple compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c31925c12---11925547747.pdf In PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/zotamopakavelaroditidibiw.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/29465762062.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/6646351331.pdfIn PDF document text
    • http://veitali.com/upload/files/5734816004.pdfIn PDF document text
    • http://prosquash.by/data/15958306885.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749305563e9---94889539162.pdfIn PDF document text
    • https://puppometalli.eu/file/xapowusogukuludezozo.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/32953367510.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa082994f8---kererobokilemepobebegiva.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/37604675810.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608af47f81bbb---79800657991.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c5c729c51---tobiwenotamebukavokoludan.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/tojokoxakipipazesixere.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/dba4c6dcc379389a845c463d1b9623f5/wisilizol.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/1941255560.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/5093e722c5cde6c5d36a6abeff578aa0/sipuwajodupa.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078af8b08098---sesojelalesuli.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/57634920199e8ce81506f097e3085d5a/xovov.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/sekagen.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca722cfca---jivoresinaleguzolujevi.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/zozobezurir.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/wotulif.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuzutaxawij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=every+other+day+diet+planPDF 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_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 17048 bytes
SHA-256: 3d522c94c169497703b4ba5c5ee07b33aaec6737b7e1ff277704b9c39a9c1bdd
font_01_sfnt_off0001360e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360E 10484 bytes
SHA-256: 1116fe0d64233aa3ffe7cc166688aa0660c3f1ade59fc1ecdfbfb200c8c6158b
font_02_sfnt_off00014dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1