Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b34bd18d882f1a7…

MALICIOUS

PDF

105.3 KB Created: 2021-09-03 06:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6aafc8c869f1eedb7b9a3b05cbcd77e1 SHA-1: 20a06691f2b056f9cc6f39bb22d82b1b56727afc SHA-256: 6b34bd18d882f1a725e8ddb1cc9150f5ed8caa665ed036c281c175d5a05c4a95
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to a link farm designed to redirect users to malicious content. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://queure.ru/uplcv?utm_term=omd+em5+mark+ii+manual PDF link annotation
    • https://bozoklar.org/ckfinder/userfiles/files/9201079860.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105af1012ccc---43035591187.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/bidixe.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/96154611044.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/jatuwafuworovifaw.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098263711994---91194591549.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/gisejuvegaw.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eefcd14976---kexupesejakasotakawa.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adb46dc712b---meniluwimamuxud.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/rixerovoxu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1610db6f628453---mupatebufudi.pdfIn PDF document text
    • https://koratspring.com/upload/file/sikuzidipefedunufuvum.pdfIn PDF document text
    • https://sinarwaja.com/account/files/lonujorowoso.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/kanisonaravovoder.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/29227162791.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/443cb9a8b6ce8bbc8b859eedab121a0b/75300191628.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/37338094270.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/limojadegujavobunavuvezi.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/68161327304.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/01579ctqpnianoonntdnqhmhu7/37099152353.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610685ce428fb---motijudonafulerulesus.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/5168387326.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de2e20b709---21265874691.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_off00013168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 20160 bytes
SHA-256: 7b07e5f1ff2023c89b6ccf171f93d124214275f7d47b0fc2e07a71d9317bcb36
font_01_sfnt_off0001665f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1665F 10376 bytes
SHA-256: e35f6162fc90d02af87ee93bba8d7bc510fad8ce61add8b90ab534bf0cd14596
font_02_sfnt_off00017dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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