Malicious PDF — malware analysis report

Static analysis result for SHA-256 7447b8912e02a52b…

MALICIOUS

PDF

73.9 KB Created: 2021-09-03 02:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 54f50bdb2ace772cbeb45a85517eada7 SHA-1: 0d9431328b80bf55991caea15edf9499cf78245b SHA-256: 7447b8912e02a52b71d7bd56554f30720ffb85c428799cda786988614aee00db
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and link farm behavior align with spearphishing attachments used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://spbi.cz/res/file/nivumunem.pdf In PDF document text
    • http://telegid.tv/userfiles/file/kasapegenikenad.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/nl9lk88k5buddtclp0llrn0a1v/zovaxujikebafasogoval.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/31294114438.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecb4bc6167---zapiwesagabero.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35879360171.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7688501b5---35713508042.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/5038vj5spq5v32a0j6mbo4tue5/49604729260.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/boxugobizilexodadura.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/wanavidemabejujojux.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd510301e66---wiruzaroravik.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/34742020198.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/72995562841.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25423794168.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0464ee5129---romarixakevikorumamaz.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/943a812f860e00eac20493f4c075debb/jesolulamozaje.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/54003013926.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/67969331ff61240ff8bd13e800c1d7a5/48030825265.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/buwezibawapub.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/sawijozakarebox.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/60867718329.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/81000952093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=leman+russ+the+great+wolf+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_off0000bca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA3 10996 bytes
SHA-256: cb4f64daf4a84f57cff211f7c815474abc163cf485994cea1dcedf2f0e0c8f86
font_01_sfnt_off0000d5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 17056 bytes
SHA-256: f877001a454ab3d41f674e9094a351fdf2670779cb55d3a50d63baee64318a1d

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