Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab3cfbb109bfdea…

MALICIOUS

PDF

84.8 KB Created: 2021-09-20 03:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c8a6f2c53f399880818d932210366fe1 SHA-1: 72724c756d027c1f2017bd51edfc69e4f38adefc SHA-256: dab3cfbb109bfdea1e5fc514dc34d0f3f9c6def6d6fbee82756fd292b80867d8
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. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://inwebjor.ru/uplcv?utm_term=lxde+on+android PDF link annotation
    • https://tenshinorchids.com/FCKeditor_upload/file/94348751367.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614701821c324---39760940771.pdfIn PDF document text
    • http://erex.hu/upload/file/duzowofe.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/wudogupaxoxozofe.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/sowunole.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/7433daaa975e9f7b6594b160292c8f53/3539955305.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/48846297768.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/kuvowebep.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/96154332030.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109032222172542.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/vefitiwazajetazubosuv.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/jajugexemudefevimefoguzir.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/10da6fb6d47b9509d957e8a05f2902ea/16488332061.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/44510433601.pdfIn PDF document text
    • http://iwort.de/userfiles/file/mogakeb.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/2761048943.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/9921237957.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/48581860193.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/91710439585.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/xifowexugo.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/70498807671.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/rogodogelipak.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/48598768408.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC897 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_01_sfnt_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 22892 bytes
SHA-256: 134f18d762cadbdf32c1ef23aa0c8c169c3c2ead08d14cc3a704bfa27e71a2a2
font_02_sfnt_off00011781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 9988 bytes
SHA-256: e57d3ad71487222ebe6409df8d27431acda5f1abbbdf7131df71cab8080df386
font_03_sfnt_off00012db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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