Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f5ee70665425ac…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 05:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4d81ac070920ba19953aa52019b6240 SHA-1: aa21b11b72596ef8509b72de09fdfe0b2f45368f SHA-256: 88f5ee70665425ac0326ee2085643eb4c910f7a6237eb22805b7e01e8466e31c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=math+worksheets+grade+8 PDF link annotation
    • https://xo-sound.ru/userfiles/file/91487453582.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe29b67a8---kalamegivopegufituvonu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/30f0c2182bff3cc4d01f9728dacead19/mobufar.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2afe428726---datakapix.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36a8899f28---97306108333.pdfIn PDF document text
    • http://highdesertrent.com/newsite//images/uploads/file/kenusikedogepolinipedo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b381985d7---webesiputozutovutadu.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/jekelunalanenojob.pdfIn PDF document text
    • http://www.bash.cl/media/file/gumubaxawoxabuvijoz.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/bowevesune.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/86214656065.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/maxidopalu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/cn35soba9q7btmetq21agkaf93/86232377079.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-14/20210714152447610442.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/58495647265.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072773b51262---fuparodazotasojatomi.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/vpf6955mvnvive893s6i7qp5a4/49836503482.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160810b55a2f93---77992267897.pdfIn PDF document text
    • http://dzbnf.com/upload/file///xurimutogikafamar.pdfIn PDF document text
    • http://midel.me/userfiles/file/balitebuxurijibib.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/sodiwoxofexapurimikomuvek.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/782665e95dea51c22fe73c89a07235e9/wizitajifipotazawabak.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://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_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 10664 bytes
SHA-256: 1d4278eea168390b3ae8598f8bccb7a18e66d8f2cd58c065fd4c4b7d93b44a26
font_01_sfnt_off0000f4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 17040 bytes
SHA-256: 6a8f8507239336ad9f3c68dfe7a21646177a5233668dffaee3c2dc6c9cbadc16

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