Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e77c224bac85634…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 17:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0711c8bd419556c6c149c1c57f06025d SHA-1: bb61ac99282ebdc8800d422b6816c1b7a286d195 SHA-256: 0e77c224bac856347d5d2935bfcecb2bf7a67c03baa924ba3d568a680e404e99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with a phishing lure, likely intended to trick users into downloading further malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=huesos+de+sepia+eugenio+montale+pdf PDF link annotation
    • http://craftland.de/res/wysiwyg/file/najesuzoworobadafap.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608513a17f28d---62538047288.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1a1a3495027c220f66cbafa727835b2a/jolumigigusetekubovugimo.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/lusemomulebidawata.pdfIn PDF document text
    • http://telektrans.hu/editor_up/46858133408.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/filovuzekedar.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/63b784cdf9505d08ab86ddb824aaf05a/widipopusofov.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161076c7ab1dac---675466838.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15ddf7d830---molumugixazesoperemiwuv.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/69447755429.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/1e0f122707c44f7337b6f6c8f5b56c14/legurarigu.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/sokalogobigoserox.pdfIn PDF document text
    • https://bloc-immo.com/images/binamodejajamobupotajusi.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/41976276708.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/3922275002.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c99f3f08d10---81232062679.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/fenozur.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/xavoxid.pdfIn PDF document text
    • http://sql110.com/pic/84252750369.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/64439953372.pdfIn PDF document text
    • http://masonhn.com/d/files/vajojiru.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/dupaxutukogurefuwef.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/76231109944.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881c055e3c7---motuvudulatogebitadopiwav.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/cf645b0d60a9952e37b2a723b86240ec/tagal.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_off0000d3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BE 19432 bytes
SHA-256: 87ad5ba23efdd02a2b1f580b1f4c6a1226626a2b4543588aae69205ec4df8bd6
font_01_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 10832 bytes
SHA-256: c0c993fda464f46519993e529d950c1b9f080075e6b67ec9d74c019dde8851b3
font_02_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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