Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eaceb608f92b11c…

MALICIOUS

PDF

91.7 KB Created: 2021-07-10 00:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9734b3989a0b4091d3e0aa722ad48ce5 SHA-1: a22ed2fd273123e86bf15ab38ff5cb9e9d87bdc0 SHA-256: 2eaceb608f92b11cb181c8a2062ca77e89f678dc3dfeea7b7c31b7080b800c9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm with numerous URLs pointing to compromised CMS upload storage, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is designed to lead users to malicious content or phishing sites. The presence of multiple external URIs and the nature of the links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://asiahijau.com/contents//files/kifazuzuwipot.pdf In PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/6d00p71vrp0899grndgrs4q1t3/99262774409.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e8fe63a19---sijukiwobol.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/fetidivumasuju.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/51fenkegvlblb5s65mtd66tqet/nerofirorisizijuruturif.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/2e93b287efa45b0ecadb66cfda339bd0/31671920283.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/89881529769.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e67619763a8e02b388fd36942d23bdde/bixafobapem.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5532a182ea32bc7f3f3191cf62c1941b/midujenidogezifadejamusuk.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/8ch8n822dvc681d75puoqg7cl7/34143021013.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210625074333.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc256ec2da---talekumoxedekavumekazuja.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/44353400081.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c5edf2cbe---59787744317.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/92018467060.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/zalisapi.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/403a85e7b7b2de6a62a7bf460eb06e3e/38158879562.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/nugorunewija.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/6355841873.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/55323597229.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/xogegumitamakulefel.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fb03e5fa2---14493931704.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/ed0083ab5b64664415004daf3ec07d83/sajegadivurivufibate.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/23283704725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+dupe+terrariaPDF 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_off00010565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 17340 bytes
SHA-256: b039465f4404bf5daa490d177c605b119c99f26eb905208ac910969ef872f7d4
font_01_sfnt_off000132a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABD 10244 bytes
SHA-256: 23c101e4b81af65a7a8b0d7ef3922ed758def4005de4062fcd4557c2d5123e44

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