Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e648736cf2d744…

MALICIOUS

PDF

90.6 KB Created: 2021-09-17 14:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a518c191358f931e39e119fe1f4c04c SHA-1: 403c5f3ee58790bc7a277d3ff2b8f5406c00f046 SHA-256: e7e648736cf2d744cce5495ffdcd1a3bda4e6276fd01a2f818f70d539731f09d
196 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 an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick users into installing malicious browser extensions or updates. While no scripts were directly extracted, the presence of numerous external links, some pointing to compromised CMS uploads, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://turismopontevedra.com/ckfinder/userfiles/files/72146583206.pdf In PDF document text
    • https://autosaloncenter.com/uploads/file/75130547872.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/lukedufezopig.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141490caa811---sererarig.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d18c0d7194---8470100964.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/nalerabu.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/vataloriwufedilubataw.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/37305317183.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/wofugamiritomov.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/31285232136.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/wepisowu.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/34635384815.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sivibexogedoxuruto.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161340aa673ecc---83755616967.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/nemokikokemakapemupopamol.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/jikosidijurijavaju.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2be30719---31546768984.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/zorozepobokinofifibi.pdfIn PDF document text
    • http://iscelenie.info/files/file/tovopotepekipedos.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/72450021467.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/mazavoxiv.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/gusafubizemivawipe.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/96364769435.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/pusefara.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/tuwobipuwuraz.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/35258490582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+screenshot+on+android+snapchat+without+them+knowingPDF 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_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 19948 bytes
SHA-256: b19a351df00bdefe69cb68f2c9540e6e40f7ab6952ff8f5c2d373f27560382d6
font_01_sfnt_off00012a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A93 11184 bytes
SHA-256: 526df7fb8fe492e9d8e019577767d4d7ab0899e4d0e72305882bf0a2bc132c11
font_02_sfnt_off00014463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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