Malicious PDF — malware analysis report

Static analysis result for SHA-256 faead97a5ba2a3e2…

MALICIOUS

PDF

95.0 KB Created: 2021-09-05 07:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36a8b47af6a391509202cf2d32b23e23 SHA-1: 14253fefcda4a72648a5f4f57fb6f2c39fd9cd34 SHA-256: faead97a5ba2a3e2698f4db49c9cf3a140e8a5d0f96c5f2467236ed93f9e09ad
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, leveraging techniques like SEO manipulation or hosting further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://keramann.ru/uploads/files/mizefiduroju.pdf In PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/kalonegulelejosi.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f8eb52ab19d55e0b92e60355f75827bf/88588416142.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1279dfabb---xexanomuwobixolutigov.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/65249dc9d0b65112cfeb7ae79ed3473a/40338033026.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/csc0pjpm865it2jhnk9p10nqfm/tabipogesofe.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d913f1bafa7a551bde2691d4d2a6995f/mojozo.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050805505373499.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160844ba2960cd---96990211496.pdfIn PDF document text
    • http://dzbnf.com/upload/file///zulubonuvakure.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/60611760272.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/sumejam.pdfIn PDF document text
    • http://turnyras.lt/Files/file/vanogurezedulutis.pdfIn PDF document text
    • http://sinostandards.net/upload/files/67709976167.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/24689080865.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/19052397366.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/jufabinidasexijipo.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/nikanunadakadobekevolem.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160834254724d9---lakoxomilawawodifusitig.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609432f3ce14e---59903224592.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/wabigovavuxi.pdfIn PDF document text
    • http://industrialdevices.in/uploads/fekodapekixex.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/94967302082.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bdf5be347---21060430602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=moonlight+sonata+pdf+3rd+movementPDF 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_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 19184 bytes
SHA-256: 026c0f3e0e9fae4f8bbcaea6008daf209d6cf2a40bec2cd79b802d0bfe1d2dec
font_02_sfnt_off000154bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154BF 11176 bytes
SHA-256: c53dc0eb6f0eb27b93685af2c10918fa7d5282bd6aba20d091f90b8b6d5b97f8