Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8eff211ee385894…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 02:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 40bae23c7bc093a77b3ab468c12e72e1 SHA-1: 4aae236977bb2414bba3749dc853c196b7c375c3 SHA-256: d8eff211ee38589492b57bf6ba69d89b9dd7efd31daa3211e93fd7f38877fd87
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the numerous external links indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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=gta+v+online+free+million PDF link annotation
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/vezinodo.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/181457543757.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/posemekejirivipone.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137345fbb0a9---sadetap.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/60rphk8b2901na1cmfgfhogva1/gidavodom.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/dafikurejibufuporeg.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/fowamigilola.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/maxujunamojulaxobesitakuw.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/82881940099.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/4975240305.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/83730265567.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/11997725643.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147377d8fa2a---wujasusuvanutewaru.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/nofekilaxexowik.pdfIn PDF document text
    • https://pecintajp.com/contents/files/gasuzugu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/78167de0214e9820c467f2b92b47b58a/31283197380.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/32922350435.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/minorevajadiponezodonef.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/47096801755.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/jober.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/turemizeterudepijewuf.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210908065051.pdfIn PDF document text
    • http://nova-auto.com/upload/wogulezafaropidujol.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_off0000b27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA94 10312 bytes
SHA-256: da7671a694813575a6e56b758a6269c9cf4d42cd3ef94fe9a7cab5ee57aafeae
font_02_sfnt_off0000e1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D3 16288 bytes
SHA-256: 6be125abe977f42b81303274efc6ba496782bb7f4acad33cba80f11afd802519

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