Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f03f1251cd3844…

MALICIOUS

PDF

85.5 KB Created: 2021-09-12 23:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a92be09aac3d4e3e4cc66821cbff74e8 SHA-1: a5bf1bc579ba31253d335362cce3ab427c7b3116 SHA-256: 51f03f1251cd38444bd2e16d4f9e02ebde92161fcfc0385f7974bb29dd860013
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress upload directories, suggesting it's designed to host and deliver a malicious payload. Heuristics indicate it impersonates a cloud document lure and includes a download button, aiming to trick the user into executing the embedded content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 9

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d29755fa82---36262033032.pdf In PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/buzopazirolikiv.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/gunufinizezazago.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/vogolo.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/20882109573.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/49278701346.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///45597968269.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/boxugowiduzofujabedoro.pdfIn PDF document text
    • https://sanagustin.cl/files/fezibesewaziboz.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/71485603714.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/83605042728.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/fedonopipifogapidine.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/wugibomovirigoliwo.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/97460308111.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210911_08222B2A7F56624D.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9846384b1---58179207600.pdfIn PDF document text
    • http://ipceurope.com/assets/file/vedelatebabemur.pdfIn PDF document text
    • https://onlinendttraining.com/files/56539749129.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/xakupil.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613019c6ba429---67130837297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=file+manager+app+downloadPDF 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_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 10532 bytes
SHA-256: fcc3a3cb86663a27de21f566dbbe33c102f23f235d5d32f538e567ffa858a6e2
font_01_sfnt_off000102cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 17632 bytes
SHA-256: ccff2f63a75891b79b88a60a36b3d5eabb1c749063142a4f4a7b899e8eb04311
font_02_sfnt_off00013084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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