Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee0a8f905622a87…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 12:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 05eec5d824c0080f83ce9f367af516a3 SHA-1: e69fef50afb7b11fa8721261050abcc171732edd SHA-256: 1ee0a8f905622a8732ab5fe77c499654887236e8d879b5a1f379ab00099a464e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=snack+video+app+download+apk+for+iphone', are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://irlanc.ru/uplcv?utm_term=snack+video+app+download+apk+for+iphone PDF link annotation
    • https://tranduongauto.com/app/webroot/files/images/pages/files/newevinuremegilof.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/buxolasobijedevodidex.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/72288271545.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14b889f55---mututobobulosur.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/27149422089.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/04894851456ccb135dda107d57e98e94/refuwidiropozixudegazevaw.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/46128735360.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/menubib.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/forosut.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/milujeporexokokatizidiwel.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/25030140021.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/82841709457.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/nolilepedepa.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/071e2b9ed4913dc16424f6187a6d7cc4/zonipijixanemas.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/gudatudesalonadobaxaxupo.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1379644041614256388a487.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/bujetunazixirufusonavupod.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/54606938259.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zediwe.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e3713a72---rulafese.pdfIn PDF document text
    • https://unaizahic.com/Files/files/47979400914.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/24336518235.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/mezolikud.pdfIn PDF document text
    • https://pepsima.biz/files/file/31881942747.pdfIn PDF document text
    • https://masihpt2.com/contents/files/48400559414.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/dujoma.pdfIn 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_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 10772 bytes
SHA-256: ea1d5c18d0cae5d62e8a0b516accd4ab144c547d2948104cc2cb687430ac429e
font_01_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 18384 bytes
SHA-256: 4bb835ecde135ed9bef0b46290d453c937942a4f212ca5213b95bcce2051569b
font_02_sfnt_off00012842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1