Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba538eae8b31ffcd…

MALICIOUS

PDF

79.2 KB Created: 2021-08-26 10:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 655cef83c699c82a59939c64c2b7eb44 SHA-1: a4fedbc20f4c08957d453037c1e91aa492be244b SHA-256: ba538eae8b31ffcd9d6408276d4e4439e93522f54ea5f2d01fe1bcb8a2e645aa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt a phone call for a fake issue, a common tactic in tech-support scams and callback phishing. While no scripts were directly extracted, the presence of multiple external links and the callback lure strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://enjoy.sk/editor_uploads/system/files/35416924779.pdf In PDF document text
    • http://miskolciharsona.hu/pictures/file/fawakogepalevuregan.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/3v2g6uj10nl3b2noq5a8f4caul/15462337615.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/lufusiwow.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9e0086086dc5a9a7c429e8d525a3cdf6/kemaj.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/79019508359.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/3254983448.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16029523444.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/xufivufupowe.pdfIn PDF document text
    • http://dgjst.com/upfile/file/dezevuda.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c7ac0d5a9---42427064478.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ad40b0koclmt2l0pisgbvdj8du/54381978806.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/20177838913.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ebf79f63---gizeminokuluv.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d11711023f2d59bbf025b3301bd776d5/85652873015.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/37331182160.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/budafefosoxefokejilawaw.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/kimuxup.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/16849215143.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d1c13d613---wevawovonimevexopozum.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/migajedafumu.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/858549218334a4c6e3ab1af9302c7708/kobobufibujagaviw.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e850efeede26b7f0a38297437e0a938c/toxanesudexekizo.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161045cf354818---91052564709.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/95sdahmc922kpe2biilae6n3r1/29833997287.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/54207778813.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/biluvikizurowudajelenanuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=metal+red+lace+guppyPDF 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_off0000d0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 10412 bytes
SHA-256: fab9600b4bf582fae51c53a233e3636bd3f62d48b8e46fc0d3ae14f5edd30af1
font_01_sfnt_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 17364 bytes
SHA-256: 0004fbc056183b576a035d13a6529ed3d4785f81979d7792e2ef15e5e8f35603