Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7d51f45d282a69…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 03:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a1307a9079f38242b1425540b5150bb SHA-1: 187ac83bc14a0be1510df93262443f71d12ac40a SHA-256: 7b7d51f45d282a692755be22fedef25eafdef626c78a05d2ae8a9f6676e3ccde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript and a high ML classifier score further support its malicious nature. The ClamAV detection as 'Pdf.Phishing.Trojan' confirms its classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=super+smash+bros+3ds+citra+download PDF link annotation
    • http://assytekservizi.com/userfiles/files/tuvumogudu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308f32f2651---99186077566.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/kadewugebexo.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/kumez.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/xamut.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/vogodijuseki.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/selutoduxiw.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/50651695860.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/60390819162.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/3446073889.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/wonesewagaruvodipugoko.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/gojonematu.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/konoku.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/vavaxamij.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/52972874178.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/d64fb26e60c021844b84fbd29f58492f/jowugibutovaropomo.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/zuzunerujuwamasamikutiji.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210907092102.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210918224422.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/40563428220.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab2c7baa06---rilisuvuvasojexefejitu.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd80f9b85c---1439652530.pdfIn PDF document text
    • http://capableapp.com/uploads/files/16754001100.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613936c7bff15---4688002876.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_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 18316 bytes
SHA-256: 7f583dbbd6302a1b993b49b6ac74f4b5150d129a64f57255f1af6e8b4dd7cb21
font_02_sfnt_off000122a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 11352 bytes
SHA-256: dfe36d21bafb92e2cb202c4234686d437620fc5f96250a72860f079a43efa10f

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