Malicious PDF — malware analysis report

Static analysis result for SHA-256 148dff2649662ea3…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 22:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c56eff50e369c4302ab72d1aaf1d4923 SHA-1: c120348fd6cb3660794fa1fdf543cf596800d852 SHA-256: 148dff2649662ea3b55b8e0c8e78341d2226c57c693fbf82a6088a90256676b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=adobe+lightroom+apk+mod+premium+pc PDF link annotation
    • http://sake-tori.com/images/library/File/jaxenuwusivefujixowazeziv.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/49558075794.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/mevugaxesuvututagovetigu.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/nuganatenuzavetugerib.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/49488062795.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/27450480379.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/jorigibazelimob.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/1379474326.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/75755335608.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/akqiv4eua6vgctgmfbhth9rrg2/gubazavazakajoxoronaji.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/varuwinekoxej.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/32612816029.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/40660463172.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/70573008776.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/63711904635.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137ddcd7682d---zefifugejelivawiziga.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2521516788f03b0f61b6484b526cf641/71793994231.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210907153711.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/bowuzeriwexapokaw.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/72420108737.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/15628260645.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/17165829031.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161377c1c13da3---31062368482.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/14354711190.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/72100821476.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_off0000cf40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF40 22232 bytes
SHA-256: 0815b0ea9c7e4bb41fbcbf04fabf19f846c3d04377cc646fca55bce74f9aefd5
font_01_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 11000 bytes
SHA-256: 6a3efe4749a626fc432054f237dd4b5e48730790034f745e76c6c96e498ed47c
font_02_sfnt_off00012194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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