Malicious PDF — malware analysis report

Static analysis result for SHA-256 9298ef172875c78f…

MALICIOUS

PDF

72.6 KB Created: 2021-09-25 01:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 72d0c6e0094e4e2bdb03a84e21fe1c52 SHA-1: df0e201407d8ceb58bb5d5f90ec38a39b665983b SHA-256: 9298ef172875c78f8a4747ab88536d2df93ab8e17fa389785dd2206e50bd51a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to a variety of external websites. Several heuristics indicate that these URLs are part of a link farm, with some hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=recover+deleted+photos+from+android+phone+memory PDF link annotation
    • http://kleinschaden.expert/userfiles/file/56236406099.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630802328.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/patowesekepulat.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145568782508---8743430590.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/12305445878.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/diluwevi.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2109240556084974606gwf4.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/34563373215.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/11556165280.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/rukawufadukosumubisisiv.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/21085520162.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109250556488874.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1cd5bcde9989b08a4e9bdfd629a5ca56/98945992541.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/34680553290.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/25760280350.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/23063363166.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/85448726901.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/zamuketosefadowuguxibutur.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/33395688442.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614e3e05a5be0---daxorojolodudarolurure.pdfIn PDF document text
    • http://caythuocnam.org/images/files/gopulawa.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210906_C6734D960EF32B3D.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3c6f176b---15944820120.pdfIn PDF document text
    • https://fishuntpesca.it/file/semopuso.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/kugow.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_off0000b671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB671 17444 bytes
SHA-256: 64b7645f1ecbee33874573befa1f025cd04beff556858987afa180181486f90a
font_01_sfnt_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 11112 bytes
SHA-256: 1cd1395e7f924b5ae773460e6fe5af4c07cfa720b7c900a9c10791971eb40321
font_02_sfnt_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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