Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa98d9c5af806cbb…

MALICIOUS

PDF

76.4 KB Created: 2021-09-18 22:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9887ccb2f0a1d5f7045b5332a73e21ea SHA-1: 71e55e27d9d64eb6df067a941fe86fa034bb71d8 SHA-256: fa98d9c5af806cbbea7f3cbb0bd0816d8ae1607d50ec8b3d3321b6bdb05958c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress upload directories or disposable hosting. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://garglob.ru/uplcv?utm_term=how+to+call+someone+who+has+blocked+you+on+android
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415173dfe4a---xejov.pdf
    • https://calendarsunrooms.com/userfiles/files/wazot.pdf
    • http://autofactory-jin.com/js/upload/files/26790663579.pdf
    • http://insightonafrica.in/userfiles/file/zetoduragivufu.pdf
    • https://kapefashion.com/files/files/12927368699.pdf
    • http://pass38.com/images/contentimages/files/peripatop.pdf
    • http://lmnn.ru/userfiles/file/jowojekuw.pdf
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/11790208946.pdf
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/99645263219.pdf
    • http://benly-carson.com/product/files/nuzoladizijopuxowewuzel.pdf
    • http://www.ap-arte.ro/fckupload/file/jawaxipazuxi.pdf
    • https://bbpartner.cz/userfiles/file/57925432257.pdf
    • http://polyacer-ecp.com/userfiles/files/20210917_025534.pdf
    • http://ipllaser.in/uploads/10222665843.pdf
    • https://yauspeshen.com/ckfinder/userfiles/files/60190323593.pdf
    • http://keitbg.com/images/files/12956181814.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161411a7565e17---pesageri.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145268d79f17---tikerog.pdf
    • http://sonarkella.com/userfiles/file/78080480593.pdf
    • http://growlink.biz/userfiles/file/finenesonopufoxesoxu.pdf
    • https://thuaphatlaihanoi.net/uploads/files/gomuxovofuw.pdf
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/97256262510.pdf
    • http://jncs.kr/page_data/file/20210918185103.pdf
    • http://newgrids.com/userfiles/file/43854948975.pdf
    • http://www.keizerco.nl/userFiles/file/tatopazapotasosiso.pdf
    • http://architettipassarinmarzotto.com/userfiles/files/65509903419.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d9.bin
c3788e7f5b3112104250d2cd118563cec4fd0c980a340496c4f10f56aa38d9fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D9 11156 bytes
font_01_sfnt_off0000debc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 16792 bytes
font_02_sfnt_off0000f6ce.bin
6a11aa58831c5d29df34df44d4ed0755802a41930c6e6cf7235ac667f4b733a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 16704 bytes