Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d5176a68a54749…

MALICIOUS

PDF

71.5 KB Created: 2021-09-04 07:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3aaaceff7da020846b3b1582e8c3fbc SHA-1: 40cf05f2aa032ff99fe8ba5852b9cf137423e7a9 SHA-256: c3d5176a68a5474929b5356532b6f8f5b5baa866131c0f880c8508cf022586b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Multiple heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/68237333cee8673b782dca55c8863a8a/basivena.pdf In PDF document text
    • http://stylowa-pss.pl/userfiles/file/nufopi.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/tanazugaxogesidafexufom.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/lilerelipu.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/7134106048.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3219203b5b1bd3b6a782e4b38693a3f0/nefelavugaret.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/dibigis.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082f21946a41---21133174742.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/bf29rk3ajegfgjunkvsc5hb1m6/17344091901.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5fe63f4e4---gegulepofanuxezusane.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609449465e086---dulabijira.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/59934089296.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/fumuj.pdfIn PDF document text
    • http://rilta.net/userfiles/files/62271018845.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/48347802606.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/74104548644.pdfIn PDF document text
    • http://inncredel.com/uploads/budopinovigakup.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/tutulonelefoludigi.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/bimekapobod.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/594e9b2465eace1e5caefd241c1261ed/nidunegaf.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/55597398385.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/10adc45292890cccea063457a8436edb/jikitux.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d421a79f02e---tuwawerulufazorewe.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/tuniwoxur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=6th+grade+math+vocabulary+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_off0000b7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E3 11196 bytes
SHA-256: 7541f1f986c5a3b473946e91aec4a7e79c73c305eaad95f9fd49e2b7a6dba2fd
font_01_sfnt_off0000d1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BA 15280 bytes
SHA-256: e9e5fe026f2f6967896eb00120c728ca177021c215c5420e506ff67184271f06
font_02_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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