Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1597e0250c210cc…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 10:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b18d78ab959c5c54ee60102330f53cf4 SHA-1: 985b7723c9ad373d53f754ff53d86a7df1c9954c SHA-256: b1597e0250c210ccd8b94756ab700f1399b46caeef93130a1d9562450adae5b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, a common technique for distributing phishing content or redirecting users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external, potentially compromised, resources.

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 https://huntic.ru/uplcv?utm_term=new+practical+chinese+reader+workbook+3+pdf PDF link annotation
    • http://camelliafb.com/uploads/files/202109061450527582.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/buniwogurerid.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613415f9c8066---59989241641.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/zufadogominewu.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/zalek.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a4f18cc0c---32157966347.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6642dcc79bd3b12cacf49be10d83a0ef/vikuva.pdfIn PDF document text
    • http://safarang.com/basefile/files/17206722161.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/28410731338.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/zuzowasubonojizibut.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/burofotuvuzek.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/saxubaduvig.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/90111889448.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/tujebanakepenezizego.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/62239156920.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/jarabiwatujevafuw.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/41054335470.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/suzebogagubifegobefaba.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/jikotojorudixitavegi.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/66io5noe61jfa446qub6gq96va/72125583231.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/zosakava.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/sijulexepeja.pdfIn PDF document text
    • https://preciseenergygroup.com/media/52367406364.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_off0000cc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 11184 bytes
SHA-256: f1f4377f75ac9a0c576f26cc9119f373513fd66f08cce966167d192f7bc7a7cd
font_02_sfnt_off0000fe88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 21720 bytes
SHA-256: 74ef1528d016f65928b0f0ae5fee5c46875cd55b6b9323e023393b351036e3ad

Open this report in the interactive analyzer, or submit your own file for analysis.