Malicious PDF — malware analysis report

Static analysis result for SHA-256 919b9b4eb61ba9bc…

MALICIOUS

PDF

70.8 KB Created: 2021-09-11 21:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4f5b8a53de759a0d9c3fc4880441c96 SHA-1: 05a8607980cb94568f2a09cd0549b81c48cf87b5 SHA-256: 919b9b4eb61ba9bc9cad8323bb74db60f031bad0f935f310a287718ca7bf5e8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and embedded URLs suggest a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://temple.mo/userfiles/file/lomojejegulekas.pdf In PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/buzopazirolikiv.pdfIn PDF document text
    • http://0048.pl/48files/file/sowesegofinu.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2a7a88edde01f895b20ce94e285fdba9/nigukisinu.pdfIn PDF document text
    • https://breedlife.com/upload/files/wanevujededitub.pdfIn PDF document text
    • https://tempegaring.com/contents/files/15757899482.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/16637476361.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/gokuzewajafiwezapowikiz.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tm61k1kq5jv1dneoe9c7icbd53/53382521097.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/migovoboredujemod.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/53589821984.pdfIn PDF document text
    • http://hibertek.com/image/files/20210902_050055.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/palonapivazarezu.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210906142319-78327629195.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/53128529684.pdfIn PDF document text
    • http://shesob.com/file/files/vemisolo.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/zorupojivuledopiged.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/68385183558.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/walapevutezufobog.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613683235e37a---pakekepi.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/rexejedazujigelosanisoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=when+will+hero+academia+season+5+come+outPDF 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_off0000b464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB464 15796 bytes
SHA-256: e797c410a72fd57dc4d12d55a11fc5ad65d9fe61909e2d8f9610ffde8383286a
font_01_sfnt_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 10948 bytes
SHA-256: db6884022e028769450a38be7e3b3761ff13a78ddb25815fe2fda843e728c236
font_02_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1