Malicious PDF — malware analysis report

Static analysis result for SHA-256 47afe4f6d9e5c4f5…

MALICIOUS

PDF

88.3 KB Created: 2021-09-09 18:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce8238f7621b78c27a4f5edf96721179 SHA-1: 1b0a3df00c0c5cbb9d46af6db0b20fbe025d7fde SHA-256: 47afe4f6d9e5c4f53dfd93820922554d55bdbf6b98e6333e75a67862a648cafa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple domains, some of which appear to be compromised WordPress sites. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=gamehunters+heart+of+vegas+free+coins PDF link annotation
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/45644556087.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/94420206431.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/14283903823.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/1908468018.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/15044834915.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/43857903404.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/30527866872.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161330df76edd0---91329940003.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210909_3F4A09C80F8660FC.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/tegevejelokimoganav.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/50688409281.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/39035825568.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/52435103361.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/zobabalegomubo.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/80391447403.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/7759472844.pdfIn PDF document text
    • http://egitara.com/upfiles/files/89689388665.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/filaxewewi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fecd72b24---susinegabevabivo.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/19577508974.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/cs44vo5ev1i4pdopcf9qf8hjm4/nebisibubul.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/50083193355.pdfIn PDF document text
    • https://protum.se/file/64776158488.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/gowanisevenamigelo.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/63387561585.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/86901736053.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_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 18512 bytes
SHA-256: 99eff2dba4a7d887080a1e7c8b9aded2cdcb625eea1ad1b5b5fa6d7e70bea0fd
font_01_sfnt_off000121fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A12 10944 bytes
SHA-256: 131f6f7fdd4d4ec5081f53fbdbb73b2b31db43684450fda5b0aff482de6d811a

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