Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ff1cc7a0f71665…

MALICIOUS

PDF

87.5 KB Created: 2021-07-13 19:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a441158397f9a6af5d388e66ac84ce8 SHA-1: c4e69c9a3609217acf589aa8054a08e476acac8a SHA-256: d2ff1cc7a0f716653f213f88dd69c234bd3e4aa01f44fd7dd4484eb9a7e1a7af
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. These URLs are likely intended to redirect users to phishing or malicious content, consistent with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=candida+is+a+fungus+that+is PDF link annotation
    • https://mides.vn/images/ckeditor/files/sujetolifazuli.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/4u5k1t0a30ckej5bms88nh0h3l/60487914948.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/80720558300.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/48948909935.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099895118c80---92348583998.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/tijav.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/jujetalowunowalo.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/78756029369.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/aanp5bk4h6p78k5du77nr3gom9/kipepepexifevifu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sql2usl8f78gulaibtqapp8on4/wavuwerugat.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7cf61d542f88f2829dddfa6e5a0997e2/50407586278.pdfIn PDF document text
    • http://crediramasrl.it/public/file/58016074959.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/zefak.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3be7204f---rakeliveworidix.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/cun5s83grggq0c7mte7vripm2l/wubuxoposivat.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/19513824712.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/6261279265.pdfIn PDF document text
    • https://ever-progress.com/upload/files/bakivazodosujigak.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/rotenazavadigewamodu.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/dagafirowivobijogefa.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d97173fde---konig.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160806f6c349b3---77063596200.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/dedujadajuv.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/13294079588.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_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 17648 bytes
SHA-256: 87fcf93c2832738b046e516066db87147d54812ffe36db05bd823cbed0ab6353
font_01_sfnt_off0001217b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 10364 bytes
SHA-256: 5f3c225dc73ea00736be0a5e420c780e076eac5a811751d51e048c8d1fa435d4
font_02_sfnt_off0001389f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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