Malicious PDF — malware analysis report

Static analysis result for SHA-256 350a893ace0c1931…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 02:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 788a0565df793efbfac46d0989d1195a SHA-1: 42c41683a44ab7220755106defcf105427d91126 SHA-256: 350a893ace0c19311332c8fda826492ad8c04a7a9552df5a42edf8b8bd03b10f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URI links and link farm heuristics points towards an attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=how+to+reset+network+settings+on+android PDF link annotation
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/4ad5247fc557f4f50d6624051bdd461f/5707345963.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/nidiwokerowolewurit.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ntjj8i6n002laq3hmo4rstsoeb/46945208869.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/90750117922.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/simazegulejetu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6514bcdb5---54801021003.pdfIn PDF document text
    • http://iucecb.com/files/file/bubof.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/8387459115.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/22404889764.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/lapanomojuv.pdfIn PDF document text
    • http://serting.eu/userfiles/files/nibikuvozerupika.pdfIn PDF document text
    • http://wych123.com/upload/files/vedagilidoxeg.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/xomuvurodasevetov.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/15027365692.pdfIn PDF document text
    • https://kermanrooz.com/img/files/60227925418.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/jexagazodiriwi.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/wovunovulolobobe.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/16009344260.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/92180322433.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/kusol.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/pezepigewirixi.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/rogogifudolaganafeg.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_off0000c02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02A 10544 bytes
SHA-256: aff040886a66b5651dd09b2f2f843ce6cf7c18acc689bcbd6ca52598eb558d37
font_01_sfnt_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 17184 bytes
SHA-256: 6fbf1edbaacdab76fc7a2379228c98cda4be383ae659d79cb70f9d76543f9b1a
font_02_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1