Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d595de7d309f723…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 08:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 67679ac884648aa1c15970533a436f31 SHA-1: 13ef0572c5cdda7fd6550b35c5bf52fbf1ba2133 SHA-256: 5d595de7d309f723c5010b31435ee8162171d7b02c73dde73adb8d6b3f33b200
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8941d30c9---dasizotitovebekibarawepug.pdf In PDF document text
    • https://detectiveoffice.net/userfiles/file/kexolibazivaromigeguf.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf3aab9a5d---77035574593.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/85190171475.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a205befae---13695146023.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1944bd1f20---suzupupesusu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0m49j9hfp28gq7ehjdsavf31b5/52468531821.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f11c1af93---24594906898.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/91795276690.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/wadogeliluware.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ef3c1cabd87cb592f2a1dcf04c1f8840/67647529938.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb8ebdc1a5---wapowunujizovase.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/41139217b91e77123c22812ced55f090/12002056686.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074057eaac87---legowefumebam.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/38734713020.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/291778086.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/55173527727.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/vusejamikepokufivew.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/bejofedefosasedusilo.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/xewolexipeb.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16109ce092212d---zanef.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/cd53e7e5f886d363fbf19cddb6fb97fa/57148193342.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fc42be144f9---66809321219.pdfIn PDF document text
    • https://kueapem.com/contents//files/fosinolax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=libro+corrientes+fundamentales+en+psicoterapia+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFF 10976 bytes
SHA-256: 66f5ac4660bc36cc2e6be017cbccc4ab5676bef3189e90555c46bd3b43b1b92b
font_01_sfnt_off0000e43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 19164 bytes
SHA-256: 2300089a25ba6f872fc7e6b37586c91fc00d36c3a24dfd8af211ae0711d6f8e8

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