Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e95e98fed88e9be…

MALICIOUS

PDF

77.2 KB Created: 2021-09-10 02:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d96894b7aa4faa436e0d732a5eb40720 SHA-1: 4feadf4fe0ed26e76b34497ff06908f5e41d58b3 SHA-256: 5e95e98fed88e9be14965bfb5c35b6e6e4a9beeb4bd6081edc66162895250997
196 Risk Score

Malware Insights

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

The PDF document contains a lure for remote-support tools, indicating a social engineering attack. While no scripts were directly extracted, the presence of numerous links to PDF files hosted on compromised or disposable domains suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://woodlandhills.ilovepokebar.com/uploads/files/zopopuvumij.pdf In PDF document text
    • http://togclick.com/media/userFckfiles/file/fekozexibuvaf.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/69550012093.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/negimuzani.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210903_082504.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab6524e13---53256023381.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/64707953094.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2278cnim99krfjl71gi4g3g526/vomekifuweralufux.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/razarudabixabifar.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109020336595599.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/zeguluxe.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/gizilopuvubipaxe.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/22363383902.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/46016718105.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/84565987235.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16131c875cf636---36016240706.pdfIn PDF document text
    • http://iviltra.lt/images/files/tovisefuxuduvisazegew.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/saxulo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a87f9cd5b1---5672523511.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/jebuze.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/jojolidekebelilojuka.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/sawekabusurijavanuvi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tm61k1kq5jv1dneoe9c7icbd53/53382521097.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/88963981074.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/21339263715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=screen+mirror+android+usbPDF 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_off0000c879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC879 10700 bytes
SHA-256: 3a12dc154f039bb339f0aa81ac57b61b1df5b9846d6f15b00d6ffac06a79a0ff
font_01_sfnt_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 17612 bytes
SHA-256: c17c6642beba6fcdfe5ef82c72d57a6705f1b9050d8eb974ad456e32fcda8bd6
font_02_sfnt_off00010eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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