Malicious PDF — malware analysis report

Static analysis result for SHA-256 16323e699f4c8cdc…

MALICIOUS

PDF

71.4 KB Created: 2021-09-28 02:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5ec7d43eeb0c04fefb2490134929bafc SHA-1: 3d9528a57235731c00d9eefbbf24e4013271bd14 SHA-256: 16323e699f4c8cdce6b19d97dc634897b28abe64ba69f486151c7801cb9cd436
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=lectio+divina+steps+pdf PDF link annotation
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/53df4668b059c63161a9ea43ac61862f/61388492139.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/tijuwuxa.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/wofojaj.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/45884447382.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/27147938935.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/xavaxavidagajake.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/21499599994.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210913085626.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/sijidarasoworeb.pdfIn PDF document text
    • http://hoachattn.com/image/files/lerujodireremiziger.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/dozomorinerofufetexi.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/46500648037.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8f5540c5f---kejajiwanu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/5111ad59cb4f80d90fff9e3badc21a7b/nizidubetidodolajuketuxon.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210916105702_75kuwp.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/90838338399.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/8421722304.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161506aacdcfb9---bikizobisajijubogevit.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147b95adbc14---74202245203.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161310990130ed---sovusozani.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/gefixarokufamul.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/sipamupuzipuzizojeniwo.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/36975945353.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/38059795573.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_off0000b640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 16368 bytes
SHA-256: 157cf1bc5bac11426ce5c3f30a18d8493073f84e8f06495da3afecd9bf21a89b
font_02_sfnt_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 10488 bytes
SHA-256: f6b5a50b9f09cab3554e53bac95491da8f59f811358ee3f98d9ed2e151b43b86

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