Malicious PDF — malware analysis report

Static analysis result for SHA-256 309239b5c9be75b5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 21:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b548308696aae5f06187329c635d9885 SHA-1: 8e80bf4208afb8ea9b97e1548228e30a735f109f SHA-256: 309239b5c9be75b50b4fee2b65688ff07cad628a88c8ff396d68d58e83e9f726
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gastriklandsbf.se/UserFiles/files/36950433882.pdf In PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614811b68d5fa---33568355497.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/duzigalofubik.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/72492173045.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/61774898229.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/batetevekoboku.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/13729302096.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/78778621471.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/fuxofowigik.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/xuzimamezabegik.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb4cb82f7---wufini.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0d3c3b95aa3d01614bc09ca87256c4b7/92763358407.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/12532935817.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/pinoxukifuwilamibaril.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/pilagot.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/20609978525.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/93571959715.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161483ee37c543---juvapegotofe.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/tojudozevuwovenuzo.pdfIn PDF document text
    • http://esejsc.com/upload/files/94743570983.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/86113175730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=watch+demon+slayer+movie+english+dub+release+datePDF 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_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 18416 bytes
SHA-256: 7c8413e35048a2eb2fccc59d1106c4ca6e7d963c1d4076a6584304166ad0901d
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 11228 bytes
SHA-256: 023666e6beb529f838228e87254717c0faf7bf7cf52e491b0d42e617d858da20