Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a8a6e00ede0d9c…

MALICIOUS

PDF

91.3 KB Created: 2021-09-06 09:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: fd53c8c5b4ed5638934b433d1794f2ac SHA-1: d1b54f25f7b4bdb1abcf50225b17ce56522cf43b SHA-256: c1a8a6e00ede0d9c25f87d94778bd85609329905f45490b02e728c6ce8d4bcd4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/ruliwizokenizotugowun.pdf In PDF document text
    • http://barcabianca.eu/upload/file/96254466760.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d5e7e5f48---24986447838.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/4716bca30ae7ffac44c074d1580d93a1/7026435942.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/43cde27772ee0aca7872e2c2ca6f0240/lobugezoxupufawonut.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/sgpn4koorqr9j665mj3prbtfe4/rexusafalinurowatim.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16072d47bb3574---71038857385.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/69428530320.pdfIn PDF document text
    • http://email-database.info/userfiles/file/11855483129.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/wiwoseveguzisuxidakibuso.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607891ae82248---24782944646.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/tlcstod40iepmjat8ec3o63fjj/nipuwetatomoxuwamav.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16126bd8e2ee77---sobetosefufaxodo.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/40833773672.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/gokiwidadosuwaxaw.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/23948457176.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/xesakobolagebekumabete.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/zofavov.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c4558779e---tudezakubopopi.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/jodojifox.pdfIn PDF document text
    • http://videlec.be/ressource/file/lozezo.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/gudal.pdfIn PDF document text
    • https://marosme.ro/hirek/file/nezazuwelazabofelipofujis.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/93054719151.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ace8cba46---1877369539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=banknote+counter+machine+manualPDF 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_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 10572 bytes
SHA-256: baa37104dacfcd2b302259c0c74e1eba27ab7c2de837c68bf51a072a3c9d72ed
font_01_sfnt_off000113d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D5 18804 bytes
SHA-256: de6a5e0170fa3ec85c578a18d4c5890f8dfda12268c87464cf774951166e38c2
font_02_sfnt_off00014566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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