Malicious PDF — malware analysis report

Static analysis result for SHA-256 c406ca8da7a13f7c…

MALICIOUS

PDF

90.4 KB Created: 2021-07-08 06:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: eb45d63282ae51526f986b57088029e6 SHA-1: c2e9d636c3d9cb7cb63eedf9ce877a9eda06fa12 SHA-256: c406ca8da7a13f7c21ebe888f259c4a46155578288e3aa17cf4e995320495732
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The file's structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/917tnk4r25jgkg37mnu0qfgur5/21811161752.pdf In PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/92539068657.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1310a82e5---mopexer.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c973a9aea2b---bozekafiturudokumemomi.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/46220852003.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-15/20210515190931817974.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/31932648442.pdfIn PDF document text
    • http://yuha.be/_files/file/torebi.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ee49e35b166c28916a5ebd39bb7b2c64/fozixawudavigu.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/6a9869cfffcb9828986ffedcf5b88b3e/32505173624.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16078904437bb9---53167848736.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/sikubimowixurevive.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ee2dc66342224ca568a48059e0fbbd40/8166897870.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160bc92db25cfc---xonemitevomagatukodi.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/d3074b500ced55adbb15001a2fd6c07b/napojibetadufurimeba.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2ea6a4ee---lapumagazevojapaweduxa.pdfIn PDF document text
    • http://hydrem.ru/images/file/44297838014.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd53c673a1---29434978393.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/44320229509.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/78488144992.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088043946125---boriwemofulige.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/jijamunilamedawagukijiris.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160873fb02384d---65526744113.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/kodebemakaxunopozijokot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+eggnog+recipe+with+alcoholPDF 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_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11514 17768 bytes
SHA-256: 2251c7e81937ac005e4befad0df54710f9e4502e3055860bda3143c02b5294dd
font_02_sfnt_off0001434e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434E 10792 bytes
SHA-256: dcb9dfc5f2a11beb944a23d551ade59cc654d5defcb3a383367abef88fe2309d

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