Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d359977de5f803d…

MALICIOUS

PDF

86.5 KB Created: 2021-07-22 08:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86e9be9a16a0a30593d9f1e24b896685 SHA-1: 5b3460c60d7a0292442c3bcbfbda71269f1ed78d SHA-256: 5d359977de5f803d498deece4a422abc4e2055afe7024c02e50b1a132c109c03
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0629646785---20940552668.pdf In PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/mubudaxizofelasurupel.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9d645b42e105a305a85d73fc29f0ee5f/54445868902.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077f0a3005ed---68901525339.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210619_100504.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b164be790fc---ropasebolezu.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609debf795d1b---wifefovokibetadun.pdfIn PDF document text
    • http://www.toptehnik.si/images/noraremuwo.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079e3561018d---sumiwutopijaxek.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/14596096823.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/12246496370.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0465dd4a44---2116724938.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/323002e23883a233a80a8e6d12e7fdb3/wojisodediwusoteduviwu.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/tujifojoveti.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608291d9154ac---72889852775.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/287cb7f134db5f6d1142f19dc1ae7cdd/gekikajemajix.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/cel37v56tdh426spr0b3evt375/setimedu.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/xaxeduketavuwazuzurava.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ade7f981885f9498897fa7da8a9d6a36/89213009803.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/xexujizujenizomipiguki.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744a5f99761---tuzifonikejuxemav.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4a6fb44d2---lapojerunawel.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/be9afc2457091fe64a38b04a57cef862/xozapuzibulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=inverses+of+linear+functions+common+core+algebra+2+homework+answer+keyPDF 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_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 11452 bytes
SHA-256: 3fdd13ec2e68d12b9f694b8c274b46e983956bd59b7c09680229c00db18ad03e
font_01_sfnt_off000102ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 17916 bytes
SHA-256: 6f3768d70039e012aa4cb423d3922f3af8bbe2e1eaf5960a4b37e89e036b1c91
font_02_sfnt_off00013263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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