Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4dd6ecb725cd8b…

MALICIOUS

PDF

86.3 KB Created: 2021-09-20 12:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52111d4e92a9b3749e2ba010cb6ff664 SHA-1: be59312d23cee98bb73d1b1b88cc5387f73e862c SHA-256: 4b4dd6ecb725cd8b75d30d9752730390b6003a4e3e6bf355460d2b13a1540e4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://restaurant-lyons.fr/userfiles/file/34470982946.pdf In PDF document text
    • http://pokeocncafe.com/uploads/files/94274353758.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/kufopetadakirereruwenokaj.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/borunadabuxivu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426f7ba9bb5---89649908671.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/65827150906.pdfIn PDF document text
    • https://visualarchive.bg/files/79437461489.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210910_4BDB1962CE2A76CB.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/jinemaxulori.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/letasosubofameluzovir.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324ab7c5104---46469115149.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/wakigorilapukositasebedev.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/wakitixitajabororariveg.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/libuximagekugagut.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/rufixalanekez.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161369663810ce---29509603592.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/36294792260.pdfIn PDF document text
    • http://asid.rw/userfiles/file/96317003841.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/83010972550.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/61521943667.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/kazuzofixanemevivimiregag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=die+besten+kostenpflichtigen+apps+f%C3%BCr+androidPDF 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_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 18324 bytes
SHA-256: bdb8c005bb587c6e7754ec341f29603077ec59c8cef2dc5ef075949eb54914c9
font_01_sfnt_off0001175e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F75 11324 bytes
SHA-256: 84ec2abbdb0b26f7baf273b258af130667f647b22cb21e72c86bb5256e766ac7