Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9fd05d9bd18bc5…

MALICIOUS

PDF

71.5 KB Created: 2021-09-07 03:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24ed57f3edd32325015d6d629c21c655 SHA-1: 133e5b9cc2502a2fd17d12acde35f5fe5a372631 SHA-256: de9fd05d9bd18bc5fe2768dead1be083c81be604b525db366467651814c93daf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs forming a link farm, many of which point to compromised CMS upload directories or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://synerhu.ru/uplcv?utm_term=nepal+political+system+pdf PDF link annotation
    • http://stardentalcare.org/userfiles/file/segulitobomiw.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/95110050325.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/290f474acd140d653e9ec717b28c073b/fapowefakagore.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/tekaresatubulem.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/vemisuxumuveponewo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/60ef5eeeae7f1c80cc008dc96e13f023/zodopalafarozi.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/qdk0n5no1smqfu4t407a4ef9u3/sokevumumiv.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa08fe4204---85692367688.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/botijuzakorajarifutub.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/dizeponipizobokoze.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/semezobabexolem.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078cfd13da1c---90296035809.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/34485408915.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/16978960597.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/jiraresegogekeseripas.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/64509780742.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/gezevolupus.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/jipododedivigomijerizodi.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c6c5295d5---dadugirezixova.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/6vm9lo13edj1239trugpd59jbn/pamegarimitob.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f25cd8f01dc3b22ba245a042e12b0a38/nexopavunidedimefupupu.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e70d6db0f---rupivenejavopixozodadutaw.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_off0000b6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B2 16212 bytes
SHA-256: 1137a08c0507b29bb2671c1015bb347f20960b9442ce59d1e57c7565fbfcc07e
font_01_sfnt_off0000e070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 10668 bytes
SHA-256: ebd5f24b70104d99a944577957542c2ac3b3bb92c95f77f1f362b80ef308abad
font_02_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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