Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e33928dacbc038…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 17:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c4a4cb08de1c86d519c88dd52faf4dd4 SHA-1: 5eb84e28f9ad5e5626497722b126210dbffc9952 SHA-256: 87e33928dacbc0383f4e5d638233a3b1c9a4c5adaa81126fd03a63ace88238f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and compromised CMS upload links points towards a tactic of using these sites as a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://demircanticaret.com/userfiles/file/gesusisuworeg.pdf In PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-4/20210904052812113597.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/21692920059.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/wazidisa.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/85927562866.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/xoxoxum.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/nizomivumemojatu.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/60589784596.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136da369539c---kovovitudufo.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/zapatizidamisizovipije.pdfIn PDF document text
    • http://envigest.cz/upload/file/52532155492.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/dororipolibodidin.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/63121144419.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/gufiwevizodivel.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/kawexubu.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/xixumowobisuvokiv.pdfIn PDF document text
    • http://midospa.com/upload/files/30105686523.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/39562223761.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/aujf23o4kb4afl907onjbq0thp/zesosowodewedawov.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac379e080---44468270685.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210905_599EE3473F119947.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369377e3ebd---wanazakifeluwagibazowag.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/73303240217.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/0cce87bf04a704896f191db4f3af3e01.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/54361851837.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/h3lo3895vito4l0rhmhghpp9nb/tiwibuniwepegixotasix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=suite+life+on+deck+watch+onlinePDF 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_off0000c964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC964 10656 bytes
SHA-256: 95ae870103f79d6fb4cd66cde9a9778f1625d012322283f5fb00bcb17725fe83
font_01_sfnt_off0000e1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CC 17680 bytes
SHA-256: 113a555c42d74670e484ffac56e941abfe89c6b428dc7567b70b60b7cc7aa1f2
font_02_sfnt_off00011030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1