Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b870dee6ce6464…

MALICIOUS

PDF

69.8 KB Created: 2021-09-06 00:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7bf97740390543e96d26dbe9eb21d742 SHA-1: 51034f6d57609b68181c23bcad9177f547b6c0e4 SHA-256: 28b870dee6ce64641104c13563b9c9dd4ab363a1f44def1f205cb755f8e9b6d7
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 compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://arnetbilgisayar.com/upload/ckfinder/files/ledagajajeduzogezox.pdf In PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/1275266475.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/2b60385ddedf9977b81f4725aa67e189/40808745725.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/62294417055.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/guwuxamidolapariroxatax.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/23576526392.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/98176592430.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210627_B9AA259FB7C0AB27.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/muwosisowupesedute.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a486401c35e---32310793598.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/44644744738.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/49619279393.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fda54e0f777---rofit.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/vitifotirobetap.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/kajararojosawam.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/nogovelajalimovefe.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77d166be5---27267160750.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/18541963236.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/94177911373.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/pekesakedozaxugibagokulib.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/rarejujewafopotojalalal.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/zarakekusesiguxujisumom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ordering+negative+numbers+year+4+worksheetsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E6 14684 bytes
SHA-256: a5a826e1f4c2d43bd4b4f2f7369ed79066dabd85fe49dde1cc27998842812c82
font_01_sfnt_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 11352 bytes
SHA-256: f2a6e187bcc713fbb2ad058a5cb1d1c0a0ec766128ac967133d64b98036d26b0
font_02_sfnt_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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