Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad3e0f32a423cde…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 05:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0266e208e72b1f0e75133f37f365d08c SHA-1: 715a780a9bfa938235b26cebbb2395bb8f3ccb49 SHA-256: aad3e0f32a423cdeb6f5f72e0223c5e0c5b3d9264db596a2920a02e56ed0ee87
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. Heuristics indicate this PDF is a link farm on disposable hosting, likely designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/a52614a1764038de2fc83bcfcc580f44/92149117969.pdf In PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/fevufutomitidigu.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/fopidemisetelud.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/pikunajijitasaba.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/bimomuzujorekovij.pdfIn PDF document text
    • https://pindimana.in/uploads/file/47655297847.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/77632332133.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/vijodikul.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/81178299580.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161444a6b6c8d5---nivaturawijozinejesi.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/35348076055.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425405e10b8---fobaruxurefegolurubofepi.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/rewavadusojesej.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/tozabo.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/13813878392.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/bipixosameretezed.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614529459b6d0---90025577846.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56749298285.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9c510472094b1aa305c433ca444b53d3/91610113830.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/wugobomaremegise.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/28200720445.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/fepewife.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/4968571630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=most+downloaded+games+in+play+store+2020PDF 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_off0000d45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45F 17956 bytes
SHA-256: 258bfb62d162350c79934630454a7d5c1a1655f49268e253f1f4c6cd858906fc
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 11172 bytes
SHA-256: a5b3f9cc65ff5557ad7527ea0e972de2ce3a8a85811c46890e264ce074ee4541
font_02_sfnt_off00011d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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