Malicious PDF — malware analysis report

Static analysis result for SHA-256 898957164d39e021…

MALICIOUS

PDF

87.3 KB Created: 2021-09-19 13:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aaeea4c625c3b6d48b089d64656650f3 SHA-1: 04bf96af9ca0213ffc2246f77d52d2624d72b037 SHA-256: 898957164d39e0211a6a4f66353256dbab1eaf837b20a94a69b0c92a52323c6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various domains, many of which are associated with link farms and compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing lure designed to trick users into downloading files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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://gianphoiduyloimodel.com/Images_upload/files/65940520559.pdf In PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/46242940518.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/mixik.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/59814726801.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/13626033705.pdfIn PDF document text
    • http://rentaruedas.com/files/others/40668431678.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/fd108de4263db824005e1d127a6d5873/lexupaperakosiwidi.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/zogofefokemanezikuv.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/mabun.pdfIn PDF document text
    • http://jocafoto.com/fotos/file/jesajonoz.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8b5fd2ead8b4919837eefef8cd9f6b0b/97102670792.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/97547721396.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/75437547351.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/zokomimamosusomopukebese.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210910185240.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/gusazete.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/tesiguxejotikiso.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/dabuzofagalabigufetabarav.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202191200297892.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210902055835.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19a42f58c---38336001581.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fopodukodegunazajexomo.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144853becab9---fofopalelovotiwoperas.pdfIn PDF document text
    • http://soles2walk.com/data/file/17041972367.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/xuwadevaba.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/kotinulajubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=gta+san+andreas+2+download+for+androidPDF 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_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 17636 bytes
SHA-256: 7971664a1febb55e231e6f749dc69dc39022ab34784f8974cc43ae26ab5e3867
font_01_sfnt_off00011e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13651 10592 bytes
SHA-256: 6e9481aa36dc92b5ceef8f63942d82c842e7795dc0982e196d9410d80a798b19

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