Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd527c8d599bd51…

MALICIOUS

PDF

78.1 KB Created: 2021-09-13 14:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 094dc0472c83f0a13f8d49bc494a39b8 SHA-1: c798e87e7c7f5ec61023f84f49b3380a3f79abba SHA-256: 9fd527c8d599bd515fdd5a0379252b54ef1a2f32bb24438575e2184e3491d73b
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 within documents. The sample also includes numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=modern+combat+1+android PDF link annotation
    • https://saglamahsapkutu.com/img/editor/image/file/50152570289.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/29768874312.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/13135493387.pdfIn PDF document text
    • http://ebus.cn/up_file/file/latulikaxidaban.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/vizanasuvofexel.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/zonugufime.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/14759788801.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6209c7e1bca3bf690c7fa48506ecaf82/948277883.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/86233753838.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/68226365802.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/rututoxigupufifo.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/juxajitojoxusumalusotuza.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136203958bd7---wigimilalavaxeke.pdfIn PDF document text
    • http://keramann.ru/uploads/files/87353238292.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/bovupawawipiki.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/vomatofetululukutimaxor.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/58638809238.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210902075030.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/fivulub.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/notivinomurubujokep.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/67086028153.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b4735234e---sizuwirobitevukasopev.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/75115999103.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/89776060478.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_off0000ce5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 17224 bytes
SHA-256: a810e8a84b327594da930e62f8923a87e28df54c219dd6327025bdabcadea464
font_02_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 10500 bytes
SHA-256: 6a0a6e64bf66d67eb71121f7b92da6b64ebda4119828a54acd07fd2a168e8ccb

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