Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ef82a80c4b581a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-10 06:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8be8552d67cfb683c9636a8fea13150d SHA-1: e6db5d36fcd5f697621004fe44653615c6599843 SHA-256: 52ef82a80c4b581aab603bc7a5080172ee461d5dd8f2a7d25c97b332bd3e5d2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of URLs, many of which point to compromised CMS uploads or disposable hosting. These URLs likely serve as a link farm to redirect users to malicious content or downloads, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://synerhu.ru/uplcv?utm_term=torture+pony+apk PDF link annotation
    • https://zd-zeta.com/uploads/files/202109070356137590.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/panib.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/2656449909.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a005635c0f---37642529344.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/446501497.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/revabipobebapenibirapapa.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/51535746070.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/4297806014.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/ruvamonuvirojizuzufe.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/pegivafuludemenu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328a249a4bc---zugibobe.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/momobabekopawiwofov.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210902140905.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/lutuporutipikojukopovegub.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/zakevokozusopenakizi.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/89298100869.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/kujigefalonefofo.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab4262d74c---65567218655.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///muzimokenoxupexoxumolove.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/banuxabikejefom.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613158bd92054---31851389004.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/gefunef.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_off0000ba41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA41 10208 bytes
SHA-256: dbec4c3acd14b34d9014068c4a4c8da3c6d4263d31173178122f1f153a11a5dc
font_01_sfnt_off0000d150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD150 17364 bytes
SHA-256: ded7833e7db93122ceaa0cbb86c1ca470eab533450b35e64d01d76c3456bf50f
font_02_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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