Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8b4b32240c2b2f…

MALICIOUS

PDF

94.5 KB Created: 2021-09-15 22:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0dabceb0a4e90715306d8bb4a51ed1cf SHA-1: f68e2cccf430e123c385a88599220ab824717de2 SHA-256: ca8b4b32240c2b2f789859f0265836661a3fbbd06f2a729104be4b4081d5c6c4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, indicative of a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as phishing malware. The primary attack pattern involves tricking users into clicking these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=original+jungle+book+characters PDF link annotation
    • http://veterinariogiardinelli.it/userfiles/files/wesapa.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613776d5f3882---45314621842.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/86112007775.pdfIn PDF document text
    • http://regmac.net/userfiles/files/zukik.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/3looem1lhgnhiirf4tcv48v4t9/bokezitenugizuzeju.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1aa580c10---36543633370.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/5855768424.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/jasabenojitelebexuret.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/jejivakuwemubosubaminujul.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c089cbfc68---xorowupunajebomojunejina.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/29549194981.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/57947487169.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/fafif.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/16011182490.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/56332915074.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/rakiduwa.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/mipulasujezasedo.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/7517854141.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb04c1f9e---9537816522.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/gonezimolakas.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/jonafeboziguw.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/fijefazugitovededobe.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/vefuxomodeji.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_off00010c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 10996 bytes
SHA-256: 5ea8b9db3630886a56845402707dc34ec086114ac5c18d44ddc9ae27342e1bef
font_01_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 17880 bytes
SHA-256: efd4cef5d5ddbf8b55397e27b9d42ed91720a23fde1068f71b5cfa5826a09d42
font_02_sfnt_off000153fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1