Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb0986ea0ad3b91…

MALICIOUS

PDF

73.7 KB Created: 2021-09-21 07:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f755b5ab57040709c72c0ced85acc2e4 SHA-1: 0958c3f37c946d55c5b3c1cd3aa503b957a55bdc SHA-256: 9bb0986ea0ad3b917c7282bf6b6c6d536f29a58ed5608169bce8b61f35f2beac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to host or redirect to malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file, likely serving as a lure to download further payloads.

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://smidgel.ru/uplcv?utm_term=seagull+assistant+6.5+apk+download PDF link annotation
    • https://umartravel.com/files/16741426669.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c976badf7c---mudunatebexawiwoved.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f1b20b631---xajos.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/23050921374.pdfIn PDF document text
    • https://thehouseproduction.net/file/rigafexisapunapajilivileb.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/baleboxivuwebunatuzelame.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/jigotovijes.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/90570861353.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tutawog.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f53a261bac---juvivat.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/a883d3208be27037b74244ac1b210ee7/pumiramomegulokoterinorar.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/28484420368.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/tibarizifizepimiruxoje.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/jerolotiputekeralap.pdfIn PDF document text
    • http://aurora-c.jp/files/files/92335846956.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/fekowew.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/godanojosavojawowe.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/88545597366.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16130fcfaf1c25---5377435691.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161492df2644e8---betosisowobaxole.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/16318682143926345289.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/gibexoxonulawepurixuvur.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16146c47f2d2de---86639134299.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/uhjp136uhmviaiq8gunsbodk7c/fajilo.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/ronunekesuxawebafesux.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_off0000bad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD2 16936 bytes
SHA-256: 26cb24823af7fb16b970c6ddd880a0f2daa05b53c872cd5d931e5cc2389d53bd
font_01_sfnt_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 11188 bytes
SHA-256: fb851513fda73980ec937138c82bac747d5c064066cacdfa312c45e1dd44ca26
font_02_sfnt_off000100c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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