Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c63882843dcfcc0…

MALICIOUS

PDF

91.6 KB Created: 2021-09-02 00:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6061c25d16b3541cb250adef68dbdcb8 SHA-1: e63f8a50e146e23873cc622982f427af5bc49d90 SHA-256: 1c63882843dcfcc0602efdf5f1316cf24d758b78c9caa5518ebc00ef2a5066d7
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 0.9513

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://krisoc.ru/uplcv?utm_term=andre+gomes+barcelona PDF link annotation
    • https://thuaphatlaihanoi.net/uploads/files/96066338327.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef026a93e6---sexoluvagokexej.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3abdb9562---gewaxedil.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/xobudixafujukalur.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/22592390367.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/s2rru2ipmg80sn5b885em3nbc7/vijotanepugusowonopibofa.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/tixixu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f7a5dc9cb3cf360da634edd14bd90cb0/80066579139.pdfIn PDF document text
    • http://farashimirooz.com/files/mitawepase.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ntfmmn7l1l1tv3618pt60949p4/55150205928.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fb30559f---65648679416.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607630ddb40b5---lirajemegijivumewole.pdfIn PDF document text
    • http://quinta.cl/upload/files/mabuzod.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/1da262978370e510552c6010b217832c/94206470681.pdfIn PDF document text
    • http://hms31.ru/img/file/51975746605.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d33d5023ae4---dazogiveze.pdfIn PDF document text
    • http://hilltoplancers1975.com/clients/13753/File/25633394616.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/36144464964.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e2a9084a---napegopeguzorovudazoba.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bc2a5b4a0---1128708128.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/rumemoxulunovajotidem.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c303bf588---19241229617.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/63639542122.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/843990c7a738b1cd8f69998e26783a17/38683581111.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb55b64f892---pomugit.pdfIn 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_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 21872 bytes
SHA-256: 1c97ec69cf4487bcb65b2f9cef6a26973c71ca7c55c9f8fc80e2d3de7b6a9776
font_01_sfnt_off00013d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15526 10644 bytes
SHA-256: 92292d9bddb7d7a7c65b6d1c1181eabfe37dc797a8997f70b3c6b31597391569

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