Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0cb9d599a3a2c4c…

MALICIOUS

PDF

86.3 KB Created: 2021-06-30 08:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 76785538c3c750ad206d694b24614d9e SHA-1: 0b26c8c42d568fe942f9e17e8689d06749854363 SHA-256: e0cb9d599a3a2c4c2961fe556d49f0b61766bf3becb9ed1f50bb6e0db89d3539
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs pointing to compromised WordPress sites and other disposable hosting. These URLs are likely used to redirect users to phishing pages or download further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://crysiq.ru/uplcv?utm_term=dominos+online+training+answers PDF link annotation
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/j594ijsi9e0d0gob0cdfp76u2j/xadaxovogewitowigoranaret.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bf70729ea8b658172a962c098affeae3/bonijegalezipovojunomojaf.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ac05cec6dc2dc191463676bf36a7aade/rojojixe.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/15438b880f380ff5f279075870fffea0/41759390123.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/42811853648.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/1709553995.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0001c770---bawutoli.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/81820222832.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad2be7e70a---negen.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/wagezop.pdfIn PDF document text
    • http://asustainable.com/global/file/gipulaj.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607815902781c---gizuluzamozafologasopa.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7d2b951f0---duziwowolowenibujupigun.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/cfeb6013fa8f0b36bf1d469c237d119f/98374760070.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/38115470114.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/refabudikuzulitaxanoj.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/0e7cd8a264a9f568589af47c5fd781b6/favedijako.pdfIn PDF document text
    • https://noventa.cz/media/files/file/vasupixorigafepiv.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/pes56g1urg695kdo3ehl22k387/54532878523.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc36257a6---26665033928.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6cd210fdfa158324e24e68b16959fdab/vapejejajapewelogavet.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081385895b30---lopejapatoralidev.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/3b783dp0ffhpkih5v131v8sa7e/28921872329.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/53canhpeh27rjp6tq4gr2tipk1/92721353861.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_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10689 17416 bytes
SHA-256: a33d43066cd703229da82c4ce6e61f6ab9faf3ce2c339553b35893f686990aa7
font_02_sfnt_off000133f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F0 10536 bytes
SHA-256: 9459676d29f99c287dad3129a8cd67d2b4d8f5731f217a911e9d09865881b6c3

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