Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ead76a10e0ff50…

MALICIOUS

PDF

84.2 KB Created: 2021-08-20 20:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5dbd825035b10f468b44bb9970ff5362 SHA-1: 47583a8fc75660aff356f9e4c6d4630ddbb0cba8 SHA-256: 66ead76a10e0ff503fc10b57b707b9285fd52e430d1bc57d0cc91837ac890fac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the nature of the embedded links and the heuristic findings point towards the document's primary function being to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://oniceh.ru/uplcv?utm_term=encyclop%C3%A9die+des+plantes+bio+indicatrices+g%C3%A9rard+ducerf+pdf PDF link annotation
    • http://hakkabrothers.com/userfiles/file///76985268669.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa3e88163ec425de870832da656988da/95159473706.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/p2c334hghdqkfb59udmc5nkug3/wupul.pdfIn PDF document text
    • https://faceless.me/userfiles/files/begebovudixolago.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da38319c31a---75495262229.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/sizekidilufifedekujer.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d1901ebb37a08833379d7c941d37ae5/gupamilogapirasaxu.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/kagixoj.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/zoravo.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/nugaz.pdfIn PDF document text
    • http://novichiha.ru/pic/file/nizowidemevotimuxe.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f860e5bda5ece771f211f91c251e889c/babova.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160971f5a34dd3---zijafexutetovenijawevamof.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/37349516985.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/8072480172.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/4fl755v5a6gf82q0386isv3ial/85916167635.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210713/file/1626141380.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/zemuporeliweleku.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908747eb10b---dexewugizowedigifafaguni.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb34f1254---fakore.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59ffec3af---41211597286.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/14833048575.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/73551571257.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/as0dm2b5ke32ihaiasjj63bcul/60460188163.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1eb660cc86283e7963b4ef70d2b4686d/jukoge.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_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 18620 bytes
SHA-256: 1c454d166f59edf1b0f3c67447cbb90bc67dd87d38c8805446d6fabcd63610bd
font_01_sfnt_off00010d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D60 11284 bytes
SHA-256: f0afb0b7d75c2a600f1046d657997c89818725cf9c4f8f4f9d81f5a971653dea
font_02_sfnt_off0001274c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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