Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ccff5e7fa51ff1…

MALICIOUS

PDF

84.7 KB Created: 2021-09-11 04:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c8166bc215ad996a512bf52f98e89230 SHA-1: 86c54dd762aa5b0636729f43e4cd89f871ed3dd7 SHA-256: d2ccff5e7fa51ff1e618ace89f7484df67dcbf792d8601cc23e421fc2d748fb4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=grey%27s+anatomy+script+season+1 PDF link annotation
    • http://simpelms.nl/userfiles/files/ribog.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd99866cea---zerofolajagaminil.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/53434586811.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/rovegad.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/39388745004.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16308045830789.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/72f7tgunb2sj47sp3dvrm6ubso/makoxovajij.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/povabozatetu.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/metowatojefugonelox.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/nemovafodalafewibugo.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/runupavodoxenomuri.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/menibizekonakaloweju.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/49858783872.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/93787291377.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/33178605402.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/nopuvunu.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/bezokuwugebosebapefakol.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/paguw.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6bd28d35---73990472968.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/pivigosudedosup.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/sorudefiropiw.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/febog.pdfIn PDF document text
    • https://frisch.ro/files/file/gelawulolizo.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/nibomelamenexufeviz.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/fivavovijujarekifedazeg.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_off0000e1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 10728 bytes
SHA-256: 687b6f0268aa4124855b92cad25bc320c8c5372aa0eba9269a62586a537ff391
font_02_sfnt_off000112e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E3 19276 bytes
SHA-256: 133c9a09c942d16e9e60bfa963a340be756b2ef136c638e790e1d582a6ac8db3