Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e3cbc15a8dc026…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 05:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f493677ca75fa2f97d22514b832e60b SHA-1: 5340a7ae7c013044f0825a417b4319e52affdc56 SHA-256: e4e3cbc15a8dc026232f4665d6d7cb82877c8150af3109ffdbd24424225319a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to disposable hosting sites, indicating a link farm designed to obscure the ultimate destination. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://andrejc.si/files/file/99876562939.pdf In PDF document text
    • http://angelascanu.it/uploads/file/levapelatezinudawumemiza.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/jusiviremutisara.pdfIn PDF document text
    • http://apex-architect.ru/images/file/31629393595.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbb6f8674d---69893504367.pdfIn PDF document text
    • http://techmechengineers.com/uploads/63231577998.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/febexojolipevuxu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f3be7733---posetedizigeribojixiruder.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/5329731461.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/wujusi.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/sedalitagimenofidopujogi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19033da1b4113a999b6c146d9f69897a/80289853514.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/mudupipaladipisawofoga.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/96095083855.pdfIn PDF document text
    • http://aquatherm-graz.at/files/fetotuv.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161303aa3520ec---30231196640.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/lokorenu.pdfIn PDF document text
    • https://ebooksweb.net/files/file/vexataxezuberonujunodo.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/nisuwodaxetanigip.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/paropaxidokejitawiniriw.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137819e03e89---39458919905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+of+luck+laalu+gujarati+full+movie+download+720pPDF 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_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 11784 bytes
SHA-256: 7ae1e908e5dcecde62f33aa21a208b21e5c5c0fbb2b71021c63da3f606769482
font_01_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 17224 bytes
SHA-256: deee7bcbef6bb0cc034964f31263842b369db257a33f5bec074aac0a83df09f4
font_02_sfnt_off0001246f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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