Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddb66269f1e88fd…

MALICIOUS

PDF

82.3 KB Created: 2021-10-08 03:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4fa7268fbe53103a467152a143a287bb SHA-1: 5671cb16c801d252c50fca4a4333b2921bbabb26 SHA-256: 7ddb66269f1e88fd43e65d2c511da382c3167d09e703d306b4de00440acf98eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous URLs were extracted, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://ketchas.ru/uplcv?utm_term=security+interview+questions PDF link annotation
    • http://snft.ro/media/file/35635867976.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/31907867893.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/wurunenagumajidukuvo.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/savep.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/folerunumije.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/dusarukidirilotaxumut.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/31874350687.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161580da25d9ff---70852964427.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/benoveteposirofape.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/53075900562.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/81588144316.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/buzudosimiku.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/rujugatibosumijabivotu.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/38351593190.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/17537949289.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615ebd9b662dc---vanesubifijesipoz.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/93506793388.pdfIn PDF document text
    • http://annabarons.com/files/files/lizidoxizik.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/savef.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/13ba135abfa6f201a293b76b19c1f13a/lodukonen.pdfIn PDF document text
    • https://sanidom.pl/img/file/givegefadotakuw.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/99398993437.pdfIn PDF document text
    • http://wirheiraten.de/images/file/salojajusa.pdfIn PDF document text
    • 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_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 10604 bytes
SHA-256: 6ad506754cdd6e6314ae2f37cb7055bc20bb954968e4c70953e70056051268b9
font_01_sfnt_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4B 17512 bytes
SHA-256: e496e38d9e9ef924e401c93f66c5c20d8d4d1f0cce668f5e1fb702651d5b3646

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