Malicious PDF — malware analysis report

Static analysis result for SHA-256 9028e4643d827b2a…

MALICIOUS

PDF

88.1 KB Created: 2021-09-03 21:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9b1366dc24e0fa15c614f986349ce8d SHA-1: 0c9c197f2751b6dfde150c1ce247c4e8a38e0a9c SHA-256: 9028e4643d827b2a1766932bbef534169c45b8ed5bb7e064fd7a1807e1992d55
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity finding for a random URL link and a critical ClamAV detection. The file contains numerous links to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the nature of the links and the ML classifier output strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbaea2539fb---gowevalutenogijakubotugox.pdf In PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/27243842556.pdfIn PDF document text
    • https://khanikango.in/file/zawogatigijokubole.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1626866264.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/1af282d70520a1a9b5aa42cee41f8726/84840781181.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/f0f18ca8ce06abc8d0399e177d0b522b/posigew.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/wedisowuva.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e0e3b2b689dc348081fb4904279e143e/88330300855.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb57fd3f5c---79763416423.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/a0c0460t1kodeit7186k19u4s1/10393033592.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210801101057.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113610d46e10---gosuzedadozegixani.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/34167684464.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dce1b94e---xakapuzelakapekemujuliv.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a464c0ce03---56147139017.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/tuvowebulusifotuxukisan.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e66d1ucagj1l8os3sjh4skqqi0/nalojadanap.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/86196d62e3c01bdcac662640ba719c7f/segekavobikukikapubu.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/75931046606.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/21274472562.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2hi784munqg3hbeqlpm2jdkdls/27500165360.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/48991305584.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ebf52ab95---zutipibosadifemaxo.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/31046ad9672947713a654ed96b8bf4bf/94382210718.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/zegatovema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ligeramente+peligroso+pdf+gratisPDF 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_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 10796 bytes
SHA-256: bec2cbc14b06e4b1949248c3aabf43eb6425a04670be6c6126cc19d8fb2f90c5
font_02_sfnt_off00011dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD6 20948 bytes
SHA-256: 3a496d2d1898bf40f625ce95e37e59d089c276664555636f068b246a27683397

Open this report in the interactive analyzer, or submit your own file for analysis.