Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ca2d747cd9dad5…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 22:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49cad480cf023d54713520cfe37b132c SHA-1: e9af4a28447a773775d7f33ef389a03bfdace401 SHA-256: 15ca2d747cd9dad57356932ad095092902d13363c8c769b2e0e565b6e8e284c9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document uses a cloud document impersonation lure, attempting to trick the user into clicking a link that leads to a compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous links, many on disposable hosting, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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
  • 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 https://tonerihned.cz/userfiles/file/maseretozewelinotapideji.pdf In PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/fafetedupoge.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/5472112297.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/22084926098.pdfIn PDF document text
    • https://htchninc.com/d/files/mixapemobazasazunegulo.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c430b93a1---witanodawovalajikagora.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/fufininepe.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e7dd399fcc84807ff3ed25e69ab83cf7/77053431712.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/53386349559.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/xofotugivego.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/19817950749.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/76751556024.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/fexolidulizuvojiguzuvisuv.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/12394403804.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/buroxuwidemixibaba.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/60398556134d285e0d93.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb5e4f31c---satubebetunow.pdfIn PDF document text
    • https://megashina24.ru/files/files/zazalemo.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/femunu.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/vatujedafulotifivapo.pdfIn PDF document text
    • http://fgosvo.ru/files/files/wigozopufifamak.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/sipolafajozijupejefazele.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161328a02e3b0b---75375281945.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/suzizodizokekoxureda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=can+i+upgrade+the+android+version+on+my+tabletPDF 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_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 11288 bytes
SHA-256: 8d9a29d17ff9c04b8e4b86edc9e8853df1c8a4053631f6cdaaa5628eeabe4fad
font_02_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 16972 bytes
SHA-256: dba79706484476be644146188b83110e724833a6dbbb4785925bd1c70dccfab8

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