Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bae1922d0aa1620…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 08:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ffdc86355802cb33f13d95554f2a7cf2 SHA-1: 398a1d92b5a34e44b251b23cd61bd1b21b3714b4 SHA-256: 8bae1922d0aa16208df1dd509ebaa4f8473817b39309520527950cc2c354064f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vwtint.com/userData/board/file/towuweniwoxoxijok.pdf In PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1c511e14a---73834292279.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd49e8196---28249673422.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/pijisonew.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/sororeravulezasaxivop.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210908025727.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/rodaveduzek.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/rabadalezifowudadaboxux.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630700444.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/88422937353.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/tifazijobusesugup.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/jarukalitatovizetaxixuvi.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/mujezakupefifepanakana.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/ledarifod.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134f98523b09---wifujuraxasezoz.pdfIn PDF document text
    • https://preciseenergygroup.com/media/48524894300.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/59133033872.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/15389694688.pdfIn PDF document text
    • https://rafautama.com/uploads/file/kamazivatugo.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/vubiravinipowes.pdfIn PDF document text
    • http://inica.org/files/file///30964581554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=free+skin+ml+injector+2021PDF 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_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 17320 bytes
SHA-256: 5de36a1f268aa49e7c8dbfb4c2bd707a9c0a3d278220a05cead0e09b12f05c7f
font_01_sfnt_off0001012e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 10724 bytes
SHA-256: 22b6337462b0331008a09d284da2dd5e0c4f33af8a43c82845dbb9f0b2709609