Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc54b12dd4b77166…

MALICIOUS

PDF

83.1 KB Created: 2021-08-25 07:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ed2eb3d279a1bf5435105eb9aa5fa82 SHA-1: 84f4ffcab1dd93762000574ca5f905126ef0138f SHA-256: bc54b12dd4b77166fac4ad6cd5d7630bed8ba1762623e9ab1660ef55ee3ac559
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://highendschmiede.de/highendfiles/file/91591499590.pdf In PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/06ab2501ae642b31c94fc690e1871871/tonulozudosisesa.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4c755cc2b---5626538486.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4395ce8bfd---fukurubivolekusuguvagef.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/fesuti.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/runija.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d5c89527d---jivepakuwawixedovoboj.pdfIn PDF document text
    • http://ge-mak.com/files/kokefimudegaxivubuxusubi.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/vituzezifawovosutixav.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/mivipalesevuritodupoda.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/9p1m9r6shof9jg6a841qhseabc/fufisilosofare.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/fiwozowurenelojafope.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/26089067024.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/15363358774.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/rikezez.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/gadutogepudesofosukatu.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/6623613566.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864937d2f7f---15705769230.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e23b4a1407---fanelevizobapokotulewa.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bb48ed10030---rekezowuvopop.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/puzibufapuzakubolus.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/19356639473.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/58823124120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=emotional+affair+with+therapistPDF 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_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 15952 bytes
SHA-256: 424297cead33339b640609ef88fa65b8bae91bd547a960ee6f5755b1548d307c
font_01_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 10692 bytes
SHA-256: 8768cf66ace62e9e5e77900f0d38fc8ee9a6666ccb98882d1f0c800f5ed66c28
font_02_sfnt_off0001255c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1