Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cca318ca5266021…

MALICIOUS

PDF

88.1 KB Created: 2021-09-13 20:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce825edce2adb6d992313983ce0d070c SHA-1: a01ccc2ceb49d9de034713c114aaf1e6bcabcf16 SHA-256: 0cca318ca5266021aa3a6ea4993673c34f20f52e120ea5b3a0009fc9a0732448
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites. The primary purpose appears to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3425711d27b87e204733f0b5dd3da9f5/27742367070.pdf In PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/waredimutefolulef.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/vakodolevetijalazegade.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139a444b78e4---49786269167.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332d8d8c1df---magifup.pdfIn PDF document text
    • https://pixel.bg/img/file/safuw.pdfIn PDF document text
    • https://derfo.info/resimler/files/15399011152.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/tenexalalaf.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/maxusegoxajul.pdfIn PDF document text
    • http://marketingnews.fr/images/file/bisobafufat.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/kevixurilaxeketivat.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161362a2e74a71---nitabajiziliwunasifabizem.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/75056903480.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/lefigixot.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/35afd2d2f9e1ac4c03b7bff9460b5910/juzanozorarivirew.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/72634056924.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/fubujoduzuwabadonojafopob.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/89212832559.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/37969775317.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/96848896137.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/jexema.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/dezisunusazuxufuponuzo.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210913051738091720mle9g.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/nemelekuxusevuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sonic+classic+heroes+apk+download+free+androidPDF 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_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 10872 bytes
SHA-256: 3d31a8f6c3f82646bdc13181034de122c0cc4110365353e0e8d84e110bfd87ff
font_02_sfnt_off00012315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12315 17748 bytes
SHA-256: ef306fd426af7b59e0ff3b6d8b35b369037b97332de75c089ace2bafd000b546