Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c41b9bb497e184…

MALICIOUS

PDF

90.6 KB Created: 2021-07-02 22:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0601870b064c048900c8a7262b4d02ec SHA-1: ba89b7a8cc8cff2e6dba69c59840dc66553d015d SHA-256: e6c41b9bb497e1849e8958e975bc7767284f7e7ed2affbdc58e6407eef0462c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1eb96f0257---64392553051.pdf In PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/4smscv999dv106e0cvj2gvbfos/27700400449.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/muxototilupewan.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/tusafusiporizidanufuf.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cfacbb3a1e796d7e7af3f7f3abe3ab19/37167978199.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/bonadalajowifafi.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ed5480ee2ad7da5f3113a1e00cab70a6/61689182999.pdfIn PDF document text
    • https://airshow-bg.com/file/22984765497.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084213943451---60594194899.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/83683649818.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/45868820115.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/12641643822.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a8731efcaa379d5d7e6266251a0b01cb/babifobavor.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/ed0fc9122646d01cc95b71d5421fd6cc/41137274296.pdfIn PDF document text
    • http://grimastone.ru/files/gojegipadat.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160918c97918f2---60537803496.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/xenaxapapusulemufupozofev.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160ac31cc51619---sosilukegavu.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/1097b224219f36969083a6de296c8d2d/tuwavixomixenawekafipu.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/nksnjt7aht6ltoib13o3ip87dkeb016i/naxusologozazepusutenenuw.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/28daff0436eca3ebd1aa61b5690ec040/57696093285.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/3ou99ajhtoggdo849h7qi65n7o/12626868124.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/19394012451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+person+of+the+holy+spirit+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_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 16960 bytes
SHA-256: 8af7e642246008b19adc63b50c85f838cbe8a8f9fe617bd0927cdae12e65dc5e
font_01_sfnt_off00012b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9E 10512 bytes
SHA-256: cf4af7f49d60aabd8116f98457b22078ab87ab02633330b0d035e3eb3173a347
font_02_sfnt_off00014377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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