Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6c716fcdb2b9e4…

MALICIOUS

PDF

97.3 KB Created: 2021-09-01 07:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c3ba723fb3b63897c1f8145914c63dd SHA-1: 06b782d883d375c1c415f3248782ddba34d95b58 SHA-256: ea6c716fcdb2b9e44cd6add16d6b8dad6b67624ddd7abb528bf9932cc90f4e63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • 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.
  • 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 https://chcial.ru/uplcv?utm_term=the+things+fall+apart PDF link annotation
    • https://netiko.fr/img/Data/file/gowipajefoloporojatojina.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/lelugofixerugevebufar.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/7706728432.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/zonijamunorozisewikivero.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/62822062283.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/zokoxela.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/lizarilaxuke.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cf24748df---vanapevejijibazite.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c921d6b789b---mobejivekibupavenazilupu.pdfIn PDF document text
    • https://lapakunited.com/contents//files/81445720432.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609604c8986ab---35133220216.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/21346416861.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/4270666957.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da729b51ac0---vujisazizizidobuwo.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/93843596573.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/499327445.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/4tq7hq3oa0ujvk11fovn97c487/13812669279.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/gemizipimenalew.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/sajonexikujilebixa.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/moredasotuzodu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/wepudilibenifezisawefuf.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/nofapivuvonis.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/delupobipi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b232b4e4c5a---26814177438.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090f7fb19e6e---90062637317.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/16d5a63j5526rgvb4rbgu2ljpt/86963145796.pdfIn PDF document text
    • 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_off00011816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11816 18380 bytes
SHA-256: e37f164ae5615b8fee1a4ba03a75fadfbe6b0fa43904b52ff7fab1b88b7271f9
font_01_sfnt_off000147f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F8 10480 bytes
SHA-256: 54d34f9678d6a97c637abfcbe8b2b169196f8178b676a5e8bc5f8a548202833a
font_02_sfnt_off00015fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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