Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3ff6c174606612…

MALICIOUS

PDF

110.3 KB Created: 2021-07-14 07:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 432d9529fe38a7c3e926e7a4693c8c02 SHA-1: c86458daa2a82fc1e3a9b6e8e202ece9de67bd58 SHA-256: 5a3ff6c174606612d51a1fee773393d4fcd3a6c93c5ac61efd7cea0fff53b41d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://poltinka.ru/userfiles/file/99775423831.pdf In PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/4u9fasdnkqqemp8hg2hvfusjvt/guvanewatutaga.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/nuximowefazivesebidorow.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/31485700527.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/didafutitut.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084b3208e236---51881030670.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/38688454384.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/rebarizasemel.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/zixomenanosuges.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609711cb822c2---54566883201.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/rumadi.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/pufaretix.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986e6fbe6a4---78270828642.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8571c5bd6e---42996599179.pdfIn PDF document text
    • https://granchefpremiumfood.it/file/fuvanedasufoduxosab.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/wegorezalevujotetasorori.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5e7d96768---nazuvepitizebupugekadaziw.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/gopabozamuxesizeketitamad.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16251485831057.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf42048cd---58153074641.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/bozirutovutepavogilif.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/19c2eb72ed45bc90d23c9803dbe81f07/sozabexun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=sharepoint+convert+word+to+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_off0001505c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505C 16456 bytes
SHA-256: e569ca87dc4df9eb943b3247d37e841e827ee453556f7321833a6c4a98b8ea18
font_01_sfnt_off00017b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B3F 10728 bytes
SHA-256: 6e2b9bcb5d9161028e9ba173d0019073957c7d4b0434ca702287217e6871e70c
font_02_sfnt_off000193e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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