Malicious PDF — malware analysis report

Static analysis result for SHA-256 341ab2a3cdce4fc6…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 20:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87b0a2c95489e54785d9bc40a33617cf SHA-1: 5dad5748baca58beec487be9369ab2858acffe44 SHA-256: 341ab2a3cdce4fc660f4ec107cc41151fdcd87904c9bf4fccf3d2e184b8ef16f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous unknown-reputation URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=jojo+part+2+manga+pdf PDF link annotation
    • https://zmiz.hr/userfiles/file/popenajumokakirilefeguko.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/62768937056.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/8260214565.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/96719402139.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/gunutexuwerupatoradi.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631203669.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/6923255858.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16141728d6ef03---83023046539.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c28f37c2c1---38645344305.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/88647544689.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/15648341184.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/lubofisedajekipetedezuno.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/2576043945.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab66ea773---xikedazekafovisagivuziru.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ccc6fee0eba774a6a6354c2d0eb95ddd/nifafavenejawaze.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/13118288140.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/11896533507.pdfIn PDF document text
    • https://curvy.tw/upload/files/wijomogifovomuj.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/da5b7b7449e5de0dc2703dae3580ba0e/mutadudinumit.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/84152023282.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161337b14e8bf5---zenolisezafutewarowa.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161415425e9c80---fujaza.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_off0000cd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD79 17800 bytes
SHA-256: 0116ea7033c5a93311d52f6b560283b25407238c6559757a7f4d14c175b34aa8
font_01_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 10644 bytes
SHA-256: 60c0cf57fb586591665e00284801acbc06868c8a988cc28091468a0ceb2046ab