Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a155fb96f50d4a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 20:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2dc2edd58ad0eb78da2baeb9305e82e8 SHA-1: b04714f8cc5f2eee390e35edcfe79baf20ece486 SHA-256: 96a155fb96f50d4a8a60909d7c7c95b8f6a8d38b3e983a467702915006a8fcf2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=windows+vista+apk PDF link annotation
    • http://eakqshop.com/ckfinder/images_store/files/sobekofarabupivukuwap.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/1908685603.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/xogulomaluginuzawixekef.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/acng91skos5u45528dkr6dio39/99658757908.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/2mm8orkjl0f749gtlufmv2q1g5/dexexasesarodobiviso.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614653ee1dc3d---lurejegesofokibibesazo.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109131659027556311edy4o.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210917192212.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/41887157126.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/rijametotuxenexoti.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/1915118677.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/15650475639.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/10628573879.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/27867512013.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/zafelalizuvako.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/ritizibezugatijakekuv.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/nexenusebekuwasozaw.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/vebojomedamupomo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/mvh9khmdv6qveb9b02al33ajbf/vinewulopolitekaf.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/84150382278.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/xidurasetanu.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/sunaxezututuxod.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/72037664335.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_off0000b25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25A 17356 bytes
SHA-256: 8b4ab207cd0b78bfbb206246fd191ecc324b2098fc99007128bf8a57bb6d077b
font_01_sfnt_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 10344 bytes
SHA-256: 87bc07d655c3c167a08ef0b0cd549ad6eb2de20414d5f0cd31df1f7fca222c85
font_02_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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