Malicious PDF — malware analysis report

Static analysis result for SHA-256 68dc7633b12370b0…

MALICIOUS

PDF

75.4 KB Created: 2021-08-28 04:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46b5b036587c8baf5d050cbe789bc7ea SHA-1: f3624de52c4fa58a2b3e77243f9c69fca5bc2734 SHA-256: 68dc7633b12370b0ddc730579720a21d6e301d432ef1f095e596c6493b5aea60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sunnyrosesschool.com/userfiles/file/13922198081.pdf In PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/48591355119.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/zigikivabidewumolebite.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/98494770149.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3b21947f5b84c2867436ec26306631f4/lomozer.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/xefojosu.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/zabixilaxubejigu.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/vizizu.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/92529014699.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/15034736754.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/8ovg5p3s9olq8lcbb7geod4v6f/73156739681.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800bb562f4f---83827858712.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/95211144837.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16107cf8ca197b---56037105306.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/xazisixekaxotofit.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c110d53ba---88263804696.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16099abdaf053d---84671263596.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/zuxufujivoduf.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/lajumilirukuzafiwujijak.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/48806829072.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d04eec4c6ed---buvatabewijuwusotew.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/77804990638.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/22609967584.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/rurosijolexo.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/7377620777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ppt+on+estimation+and+costing+of+residential+buildingPDF 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_off0000c31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 11204 bytes
SHA-256: 9743beddec16cc65b9a0487cd49058e1cd1876673fcd5e34dae5fa3ee5435882
font_02_sfnt_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 16532 bytes
SHA-256: 4968b3697e57a78bd787e65c7a45ba8a9c9780167c31cc39ae842a1e5e4178df