Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb936b2f2954e5d…

MALICIOUS

PDF

73.3 KB Created: 2021-09-26 10:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee9d7ba976a91bccb41ff6a2516eb465 SHA-1: 332f441912ab143e13736ae1e4ff9e693d0d5529 SHA-256: 0eb936b2f2954e5d98536b9f9a091aca3e72d91ef19de9abb58aab0db4f49b79
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many pointing to other PDF files hosted on disposable domains or compromised websites. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context, indicating the links are likely intended to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chcial.ru/uplcv?utm_term=documents+for+android+wear PDF link annotation
    • http://kaztelcom.kz/ckfinder/userfiles/files/xegosinexijeledosumi.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/43696696803.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/murolodatulexuwutulesijaw.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/bb0f03cc25266109d14e1b0ecfa4a05c/kewazopidepit.pdfIn PDF document text
    • https://iword.de/userfiles/file/7881736508.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b200af4016---92390365920.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec5073757a287c2d8130a3ea39b1b00a/vufanasukamop.pdfIn PDF document text
    • http://xaydunganphubacninh.com/webroot/img/files/120332965.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/46519509167.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/50503893023.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/83320680647.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/pogesipivobutepawajuf.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/59883282839.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/26476481075.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/kupifapogawofotosax.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/53780247618.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/10889375870.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xipisumovedepodudojox.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/detqqbs1h4as1h2sb3qh4mi824/84701323682.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021092421382175.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/0943e6e09c597de456109b1607ceeab3/jigivud.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4ce883a092c3d12627d40100827a1c55/54440508568.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/86457314101.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_off0000b6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D8 18616 bytes
SHA-256: 69bccea53d55494af1bf6511c70f8f44e1e3abce9c801376db658372bd2af4c2
font_01_sfnt_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 10776 bytes
SHA-256: ce6448583a50ee7a79bb244c9d8dbc998822fa23536f3c78cd66073840f7dc14
font_02_sfnt_off0000fffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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