Malicious PDF — malware analysis report

Static analysis result for SHA-256 44bc856d00c05420…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 15:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b41eca8532e5d239ee1448cfd3e5d872 SHA-1: f90cd848da64009758ae2fe89bfb9aa8d6561d90 SHA-256: 44bc856d00c05420250e29da5d6345fc7dcceb93d99d871e4fc3963d62d4fb3d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous external URLs hosted on compromised CMS upload storage and disposable hosting. These links likely lead to phishing pages or further malware distribution, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=aerobik+adalah+pdf PDF link annotation
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b74caaad3d---pobizasipasugagurujubu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/lkt9qqqcdo4b39vj29o6a6n5m6/37139263377.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b644383fd---kewimofefokaz.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/numizelopa.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/fee6262b71f33f4aba0def9e7abc9b6a/89783121832.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/mudimebew.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/jl3o6pnnsv1ceps2iicfmhd9v7/riziwinutisizo.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/puxiluxemuzox.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/xezemoj.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/9510370198.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/rebolifibag.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a685f9df696---42011545091.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/e9aef5eedffc0028f83ff1f96a86ae9c/purabimegerib.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f72f18b3b3b1076d3ff9225a3b993df8/lojulajokezo.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/benuzevivejatuviv.pdfIn PDF document text
    • https://digicpictures.com/downloads/sinerotopidonevesemi.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/rimijap.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/xituxu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/oco3fisrhhh6a7a18ts1enpqbn/demofowafilutiwu.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gdf0cu5kunp3mnrrh3dtt8rtca/nufusetupagosevufopiditum.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3196ddc49---46143040709.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/42574007652.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/bagisur.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_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 10436 bytes
SHA-256: 68b5779fcb29c1cc8600fc0470d0491ec7d178c010d523284f81962c9044fb09
font_01_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 17440 bytes
SHA-256: 7ea97f2815110898192d4f0bac3d6ab4ec7d90fb2f700f6d9fd9b6cbb17331e8

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