Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d7337793a7944d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 19:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91d1631745bb20b4ce270f3144b0ef28 SHA-1: 1308d04beaf0c4f9b5752742a930bbafe9c4a316 SHA-256: 74d7337793a7944d7d0d8a2138fcdbec4e6cfc22f478d92b2ee5c78392c790a4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, indicative of a link farm designed to lure victims. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the PDF as a collection of links on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://allytemp.ru/uplcv?utm_term=wurzeln+aufgaben+klasse+9+gymnasium+pdf PDF link annotation
    • https://ville-rouillac.fr/docs/file/rexosajudubuvimixejifet.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/gosipobisefadivivo.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/70491146714.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/lexisozipiteze.pdfIn PDF document text
    • https://ridersshop.it/file/gomivamuzikeviwaruva.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16107560876e3a---65972401945.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4e08baad43abb8b09c4f21717c75f428/rekodoxedaf.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/70636638241.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/67397126494.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990a4d38aca---vadavazoraruboxumenuroti.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9f4094dc5281b9d152adcc5245481013/94651270084.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b70218883---dudizazorewopadir.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/pabujijugosolodenubokur.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ee8b190ec5e034f20fbafee23b76bed0/3152326950.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f2e13f409---xujojuzotusu.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/wikokafuzowibibejutemu.pdfIn PDF document text
    • http://dlzj.net/upload/files/2021053008331894199.pdfIn PDF document text
    • http://andrewclaymonfishing.com/clients/a/a7/a7b0d980ee28df7184f998a87a00dbd5/File/jererogepalojo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/1uoj6ghhqlrtm3iheqmnoga9dl/munizapa.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/jadepara.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e65fce22325b586dda3f5df4647dd008/22671394333.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/32251581577.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/97824206230.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0c70caa44---fumamo.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/95257902782.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161165325a7b2f---27062012920.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/ftc6vq4637pk3bsjrild47f4f1/fobulodapokojep.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_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 11288 bytes
SHA-256: 447a68c1b538ac3f9b3c847b0ef156405e9b7441df830abb19906be669c39df0
font_01_sfnt_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 19272 bytes
SHA-256: 9ed3793b9ee121b343663bce5afb850d6eb7600f469b2bd8c2c1054eebde43c2
font_02_sfnt_off00012241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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