Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4120dc9c05a7f4…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 17:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4082ec11dbbd42626aeefda034aec11a SHA-1: 459fa15ba294562395475d1f9a8cf5a2234fa38f SHA-256: da4120dc9c05a7f4e8789dfccbb333b99508251c26624d3860b4db822527c78b
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous external URIs pointing to other PDF files hosted on compromised CMS uploads and disposable hosting. The presence of embedded JavaScript further suggests potential for exploitation or redirection to malicious sites, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=management+games+for+android PDF link annotation
    • https://sdhouse.info/ckfinder/userfiles/files/taninupiwotokitozovewozu.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kewevumufutoxukiwabupagek.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/18591696553.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/wiletupanizukunilixe.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/zilulavoxujarofalov.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/13232614616.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/30999682930.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109101804082323.pdfIn PDF document text
    • http://gist.adrianlechowicz.pl/userfiles/file/fakovosafawifekezudiwit.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5e969325b---mafavezebiner.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161422d7666db5---5226125539.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/07340ee747c1246e0d4e1924e3d90a07/kimuzexigex.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/62099440645.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143e5e6790c4---85989949465.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/13550533643.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210903_281269BEAA3768FE.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/pamigamovanawilepamunide.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/51682069568.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/nomuwud.pdfIn PDF document text
    • http://yuha.be/_files/file/11343254282.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/kowudewa.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/92605511714.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_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 10644 bytes
SHA-256: aecefcad0d7c1437a3c713916bae47259f7cf85266a3c12fbea4f4f6ea132f04
font_02_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 17060 bytes
SHA-256: 12d1faa0e205686388e2f372317e783eb65d15beb07c4da25db9dc3d74e27e1f

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