Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c1506ce9c9b5a7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 19:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 637e094a7722b8c3ef55a7b3832a5c33 SHA-1: 807376a945b59c436b23182ff9c39fae2e7105f4 SHA-256: b6c1506ce9c9b5a71302d87622d04ce77ec792a4e480d9aaa6fa97d44c2c13a7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports the conclusion that this document is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smiletoursvietnam.com/ckfinder/userfiles/files/jitan.pdf In PDF document text
    • http://alphamarino.kz/images/news/file/rexexib.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///metirixomemisot.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/gofolotojikujidivu.pdfIn PDF document text
    • http://soles2walk.cz/data/file/xuwov.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/xaroliwamebozixaxewof.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf900240c---dotekixelopi.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/damukixijonifalusakosev.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094124936949---98248193871.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/rpr93sb2ltbsodahnnt1c9io2s/36288806886.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/53335140514.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/68143189727.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cced3b6d1551422c28bfaa13a58cbc2e/retenas.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/lv7mekqm93m867imm3kvsscg7d/lasuwe.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613148b88aadf---noxotojaluxabokaka.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bcc229b75---97059343252.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091a51a5b293---buxukelo.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/tiribudevijodusab.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd8644c1e---fexukilejisizomu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e69f2057b---lazunofaj.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc789ca3bd---zororazen.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/depiwodinesaruzub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=powerpoint+presentation+pdfPDF 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_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 10532 bytes
SHA-256: eb58f3a31d6bb2581ad1f5e70a0dc94619a5e57983b6886f2b8b56c35b13e7d7
font_01_sfnt_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 17380 bytes
SHA-256: 0704a8d62db503335fd6d09437e81dd096b78cccd252d1dad85b3c67e62425d0

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