Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3e6b041c856319…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 10:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2fe1b005a0175ec0076958b11884248 SHA-1: 9ff73c13bd860f3ad7ed5532963c6475ee7f2d1e SHA-256: 8d3e6b041c8563196646a7ff1a1d9d9512978f1876129b7cc9320182eea7936b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. This suggests the primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://irlanc.ru/uplcv?utm_term=propiedades+fisicas+y+quimicas+de+los+metales+alcalinos+pdf PDF link annotation
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/jafaxolerotarawatisexa.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/jotimonuv.pdfIn PDF document text
    • https://jin-ji.com/upload/files/jevenejosaf.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/76435241368.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/kozonutemejimojuworala.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210815233314_rf0g6i.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e8ba92908---segizugusadizigamim.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/lederi.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a45a4dedb08---papimo.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/59bf5e7ce0bde53bf7098496356078f5/sijiberamis.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/93783950881.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/viseluketisexon.pdfIn PDF document text
    • https://rjpexport.com/files/japafuge.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/bumozativorak.pdfIn PDF document text
    • https://faprosid.com/file/rikev.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/91188496294.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c0d8b46bb7458dc3a67f1d0d834b92a1/77264772075.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/pifuxigigekoxavagorob.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/muwezafasuvurimoxi.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/45490763579.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/letonesagana.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/96686845127.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_off0000d1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F9 11144 bytes
SHA-256: 7bc80b3f3395c5eb01405c663de255ee27b78c63aad6f16f7ce3d659e6ea72c5
font_01_sfnt_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 18584 bytes
SHA-256: 1516014d432f016ab46ad12470ef6ddf69fcf4d167ae32fe26ee6c27d4434ecf
font_02_sfnt_off000119f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.