Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6eb944a7794b7c4…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 20:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1aa1a0e8b80f52060ff3aaf20d2f18c6 SHA-1: a90d18976302d1873a54a8a8fa6fe1ef175046a2 SHA-256: a6eb944a7794b7c4cca9be6868b948a4f73c9e4d90ea2986b3f5599f53d3cf3b
164 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous links, including some hosted on compromised WordPress sites, strongly indicates a phishing or credential harvesting campaign. The embedded JavaScript is likely used to facilitate the exploitation or redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/keritobef.pdf In PDF document text
    • https://ijpdua.com/contents/files/zawirokusog.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/xexogejasixerur.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/81309178460.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/benilowixogiga.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/kevipumigovu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/dce4ce6a003eebd3937d8694d65eaae5/31207625429.pdfIn PDF document text
    • http://thecuriosityshot.com/welasegodewuniwabasunipa.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/tudogufalakola.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/sowofinisiwovede.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613793a92dc72---67601503838.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/20082581645.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/77551795674.pdfIn PDF document text
    • http://domuran.pl/files/file/lanixemudexakibefuwurera.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d9a09e4e758d7c05af42ff08a31864df/xevekikad.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/46935349347.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/kegunegib.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/dikoxixitu.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/jelususedop.pdfIn PDF document text
    • http://venkateshservices.com/uploads/52593203458.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/boregapoxigo.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/79528411276.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/34477193119.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/tefofili.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/51588044283.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377b5194e4f---45283041821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mayo+clinic+diabetes+diet+pdfPDF 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_off0000d59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 18204 bytes
SHA-256: de1e7a7919339f03f90389c44cf245b02eb05495e95ca5b390ae1d35bb1aedc1
font_01_sfnt_off00010504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 10760 bytes
SHA-256: be71577da1a1d3951d7d1e61a26cf3edcd8acebd547010b23caeea86fc0f31c0
font_02_sfnt_off00011db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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