Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8c6697fdc88401…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 21:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c7422c5c89f4f28a1cb809bbd8b7f3c SHA-1: 4f6ae43aa370a091647fecff7e6f32b842a81839 SHA-256: ec8c6697fdc884013cda68c30e2332174c4733e432b8799e58c1cdf7212432ca
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites acting as hosting for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://eakqshop.com/ckfinder/images_store/files/55039002735.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ee94dcd68---4590099570.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d331da5549---zibomageku.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/vafenizaduzonafapege.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/dc8fdf6e7b1f9f95a4bc11d92d17615c/rosemozejozuvuwoxiwot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c123b41ea---58418999409.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/4344bdf835bcf84d40e5337467d9d6e1/rofipularirikowi.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7752b8100---ritovelinages.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/25940815795.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/67639062439.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/fipafinawokutaxetut.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/badigimadotiwutegates.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/31423663439.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/kimisafusarikavabitezole.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/kixomijoridujakebarutek.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/falig.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/ravemimeradubejoz.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/batavimakutegoxizod.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/pamiwixomi.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/62897563021.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd422b331a9---46798826263.pdfIn PDF document text
    • http://imbirimbir.ru/files/nupawiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=puppet+docker+and+kubernetes+pdfPDF 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_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 19236 bytes
SHA-256: 0ac7f5de262ed3345320827ea267bca4c8d4d086d0ec94b2329c6d9ea537aabb
font_01_sfnt_off00011606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1D 10808 bytes
SHA-256: 7a787f9646d1b8ce3ee31f1ea695100024f400824a38a527bf9177bf7e342ae5