Malicious PDF — malware analysis report

Static analysis result for SHA-256 efaad20d3632d75c…

MALICIOUS

PDF

95.1 KB Created: 2021-07-17 06:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7b55926ea244212973304ccc138bdd7 SHA-1: 64af98b16fad954d4b6e3274631acb4ae0e7c4c5 SHA-256: efaad20d3632d75c7bb01e48a500e3c5ca58e45a02bf27cc1575e84510034596
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, suggesting a phishing or malicious redirection scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a link farm designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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 http://millecolori.it/images/file/75043226655.pdf In PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc0e4ee4d---40584192625.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/goxosazodiwalodijudexedu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cf6133d52---12351699698.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/ff3fc97cbd381d6826fe7df54f94815c/xusaxomisebuvifedu.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/gekinitinakivutesolulubas.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/jogatofigaf.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/52191714723.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d0bc9284ce4dc5607434afacf5f509e8/43336435944.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/12932859048.pdfIn PDF document text
    • https://medius.sk/userfiles/file/zidewanezoxagixuliz.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/3130aa556e27d9ce2a10f9c231b749d5/50217820316.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607627562f67f---wodozov.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834ad42ad59---bukexemusasirapede.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/62510150886.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d382c854---poredos.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1e1b67ec41ae5f4415603c7d17100738/21933948668.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/94643977091.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/5gi0eq6omn30679g6d5chj5ea2/jelifobuvebagamowerir.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/85576534881.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/bogiwub.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210715_321F93CB0AA9FB09.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/43861828163.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/07a2699c96bbf31f50160bc721ed440c/vafelasitos.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/mepemigek.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/81734663492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=classic+wow+rallying+cry+of+the+dragonslayerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 20468 bytes
SHA-256: 9601d5f1463d39019d9887d68a4e7b9a3ac3f2c29ad936e26c89736aa5e7b3e6
font_01_sfnt_off000125c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD3 16808 bytes
SHA-256: 9ac07318b753ff258aa4dde0aa9fd96fe95649d4d9b8061d05aae7e181bb0d4c
font_03_sfnt_off000154f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F3 10984 bytes
SHA-256: dfae319c2cdccebb3556694c4fead60dc5c018d104654ea1d71bd2eada0c28c1

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