Malicious PDF — malware analysis report

Static analysis result for SHA-256 211ee1e3dcd495b1…

MALICIOUS

PDF

89.3 KB Created: 2021-07-06 22:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5d8c84031ad89b9f7d4a7f253a5c6ba4 SHA-1: e0f5e1db4f9de54a5e65ef41a51ae06442080857 SHA-256: 211ee1e3dcd495b175bd82c6f467f7ac92eb66ae3e7bb2f14261ff23c0dbde02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://laborke.ru/uplcv?utm_term=affordable+pedicure+near+me PDF link annotation
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ji9j3k49conoiuq8f7811dgef3/mizevudadulitufaxuva.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/73418084688.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c636d935377---mimuma.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f676d811c6623df2f3f31a2a6bdccf9f/67122378475.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832fce523fa---26023193116.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608674089bbd9---gajaxa.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/a1e2vpuns5uds29egiool2tdb1/ninepininetaregopedaxo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908c48e0f4a---76951453784.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/1335387274.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608497b504a69---vepezorotugokobipokivivuf.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kjr3n1pcfst1iatftqlgo1nvtl/serebumakepulixonu.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/28577411515.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098c1ff63d05---71747324929.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c733f9efdc6---48057180069.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/tilonuxufuwexufed.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/37484957917.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/kefagolexa.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f7a5764b8---bejimokezojabela.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a77d768e---nuzuleruvef.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/mefujigipijorotukofa.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/95331978017.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/pojonezixiwuwamu.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/86156503696.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_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 16940 bytes
SHA-256: f6376d91ab81b7d3d2ea0220d216890de12b3534509f26e3475dbd5fc40e2eac
font_01_sfnt_off000127e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFD 10736 bytes
SHA-256: b6a783242a5207702509fbc2b1e74994558add182958d17fbb155a17a2dd18b7

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