Malicious PDF — malware analysis report

Static analysis result for SHA-256 d298cbf781e1b36b…

MALICIOUS

PDF

87.3 KB Created: 2021-09-13 23:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b21784c3bdb655c1e934aad6212baf0 SHA-1: d8297ea78650e53e83209f7f2d065d99a08cb338 SHA-256: d298cbf781e1b36b74264980fe33f4d16bca612de99d761725a42e243155acea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting sites. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content, as indicated by the presence of UTM parameters in some URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://coretry.ru/uplcv?utm_term=free+fire+diamond+hack+mod+menu+apk+download PDF link annotation
    • https://mtmnetwork.net/uploadEditor/files/zapekiviwigudipi.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/090323374090.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137ada3de063---xemub.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vabijizukatumuj.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/44udhk6ofgmlml1lq920osr7q1/34442337497.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/18328270390.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/99376161622.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/nedisizew.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/83328726235.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/fikozarubidu.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/91621479970.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/47404390315.pdfIn PDF document text
    • http://balone.net/_upload/file///jezukuso.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccm41o7e4tffdndh76en4d7tqo/43846042886.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/wodenipupobutoxagenufib.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/58762622636.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/58290882438.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e413b628c---gosatagibaserorugefefoxe.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/toxetarogovodolevo.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/devigumukevej.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/namewisufugokulezazu.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/rejixupomefodojowum.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/toxifebowujopu.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/69454901427.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/31b9c1b74c03a9d7098af736d77f4a7f/wodisufidenixojamutoxun.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/45394280116.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/25502056383.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_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 18300 bytes
SHA-256: 9cfa7a48f0b7584d14a3284c4aefdbe4e1d254cd23a294e0a1352ca60c9c3609
font_01_sfnt_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F6 10872 bytes
SHA-256: 3f6b6e5a2a3d3abf4c4c02c631638c82a5cf36c46689f38ad1f1004e06233220