Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c8e4db4326686e…

MALICIOUS

PDF

80.4 KB Created: 2021-08-29 08:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c19caaf8f5e733f3b7643c1a8a3cee58 SHA-1: 66dfb917a773494236c6c46966b09b4e0b9624f0 SHA-256: b9c8e4db4326686e8b806970a2f6bed583a76c625e6c5f967d0469fc0c37d1bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories. The link farm strategy and the presence of JavaScript suggest an attempt to redirect users to malicious sites or download further payloads. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://coretry.ru/uplcv?utm_term=most+profitable+blog+niches+2021 PDF link annotation
    • http://gryfarmerskie.pl/pliki_wyswig/files/28025502744.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/vuratafe.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/dageredibajakebum.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608432003a03f---delobomuxan.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d188bbd4cf---kuzexapagurafukakamam.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/88279986727.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/xogetefegibu.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/89868022721.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c90d66c45c---xezitebajitafumew.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160fddc35ab55b---ziwisujo.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/8118873931.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/48983987950.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66af825c60---podagivozamojexid.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d1808c2d93fc7d34690854ca31b12e58/fubotigutizumam.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/bipilusedetikirozog.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/8p7njm1rr5bkght2fa7eei3986/devusesejojeviwek.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86252cf899---zisukusuzara.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bf417fd30---13215139762.pdfIn PDF document text
    • http://winso.tw/userfiles/file/venatekunaferapekodebuku.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160775eb77ace7---69516874452.pdfIn PDF document text
    • http://congluc.com/upload/files/xakufox.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/46071713870.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/vagira.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/56013442303.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160f8359b723be---rawasoranagoduxi.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://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_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 11184 bytes
SHA-256: 99f1969b98eb101842d5ada9a43d0e9eb18a933d0774c400d6f921d85e6a9f7c
font_02_sfnt_off000104b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B9 20196 bytes
SHA-256: 2de05b7f9392e45081020bc64146c28de36bccf6e2c935caf6d1aae8030e87f5

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