Malicious PDF — malware analysis report

Static analysis result for SHA-256 45606297ec94abeb…

MALICIOUS

PDF

76.3 KB Created: 2021-09-19 01:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a94bf6bfffef7ef1dc64ad597feb8ea5 SHA-1: 1d5952ab158137d0a446486890dfe3a038ba7cd8 SHA-256: 45606297ec94abeb9b0f6c2b9e0e15bfa5571069f746f37c70b61c239c204b28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to potentially compromised or disposable hosting. Heuristics indicate a link farm designed to direct users to external content, with ClamAV and ML classifiers strongly flagging it as malicious. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user, likely as part of a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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.
  • 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://dhf-china.com/d/files/lupenokinetudisumepu.pdf In PDF document text
    • https://dcmheavyequipment.com/admin/images/file/sarovo.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/29789981149.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/70417343605.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/69597740590.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/sagugezam.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/18684277530.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a22b497f---guxavafefimedolab.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090508474473499.pdfIn PDF document text
    • http://eva.am/files/05b87bc353b9b81d.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/3844856957.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210910_D7EE76595A643A77.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/09112se8sf75babm4e3l91gsa6/furawol.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/34709960976.pdfIn PDF document text
    • http://goldia.cz/data/file/23778424674.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/dixunuxufiwom.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210905193722.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/funofeza.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/90409828788.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/vukaso.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/luloganuzifivo.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/safonamowanu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b09743bf5b---gazenovumew.pdfIn PDF document text
    • https://blokhol.com/upload/files/xovibobukoboxud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=tortora+14th+edition+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_off0000c665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC665 17588 bytes
SHA-256: cdddf814a5132f82241242c550b80a34c141cb86302e6925084c63f8797f59a4
font_01_sfnt_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 10476 bytes
SHA-256: d88ca825ab8ea917a8b63230b981be9f5dece92930ab75a8219865f7d29a0ee4

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