Malicious PDF — malware analysis report

Static analysis result for SHA-256 558a819ab3dafdd1…

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 09:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d83b51227e4b69429ec3c71e147caa93 SHA-1: cc4d123924fbd92b0891c1ea9e8653ed43644608 SHA-256: 558a819ab3dafdd1d9895605dca3ff6d320534855af594a9b100ee8b2907f1f4
196 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://tiszaladany.hu/upload/file/25707967347.pdf In PDF document text
    • http://fashioneducation.ru/userfiles/file/tuvitejokipa.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161365be2a50cd---liborarokotezojeruzeta.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/5960528873.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/97991737321.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/71154080854.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/60722717657.pdfIn PDF document text
    • http://bdsductri.com/upload/files/telejitibovoj.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/75068978288.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/ketunopewinaga.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1614121f5d1cda---21669134722.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/55153234384.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/kavivusutoxavoditapofet.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613429581adde---zaxamanoreregomapur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab909ede0---56907552557.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090220504152.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/1d44f3632d89b0ab6c76a4347ed7ddc6/13045061489.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354c75d516---14411007887.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/sofefakebufe.pdfIn PDF document text
    • http://hodori247.com/uploads/files/97343498822.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/50155513671.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/030700378535.pdfIn PDF document text
    • http://teifsepahan.com/files/file/94381541354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fortnite+v+bucks+generator+ps4+no+human+verificationPDF 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_off0000d088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD088 11336 bytes
SHA-256: 3db4313f1d7de92e52aac61d8f227359114b1b531b59242cddef02d0e58ade55
font_01_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 17136 bytes
SHA-256: 55debd8607dfd9eec4500390c464eead33eab7d78b27f9f80e9e902e824938a6
font_02_sfnt_off000117ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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