Malicious PDF — malware analysis report

Static analysis result for SHA-256 9665b588e70c35fc…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 22:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 11ec3c0ce3002df3a966bea5aff0eb93 SHA-1: a4d5ffa1673824b7ca1f8b5b0b632723275928c9 SHA-256: 9665b588e70c35fce40cf8bbdbd84e6ec61338062ac06991b9a41bf0d3741360
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the primary attack vector appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://istanajpdua.com/contents/files/39858693847.pdf In PDF document text
    • https://websbag.com/uploads/files/remakedawadoxuniz.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/gilurepiva.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/56823960042.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/21400421832.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/86064551598.pdfIn PDF document text
    • http://fxlcd.com/upload/file/sifibosa.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/33461618022.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/lazagefojejojerobafonij.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/7812770845.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/v2kctajkesn97eti5948igpql0/22324901966.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/tusojajoraxi.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/potolipojerazixejuna.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e6191126d6914e471b07075a943b678c/49580219516.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/9ec4f7eeb6d1f8b257a904135139318c/32201508976.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/76982903550.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/94878444917.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/a71bc8b6f8fff5ce0db99af1eb255765/metupinorepemof.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210901065504.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/20383571776.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/96803019699.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/lufibi.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/pagininuso.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/71824076790.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/vufixod.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/wafari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=kick+the+buddy+mod+apk+gamePDF 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_off0000b207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB207 10980 bytes
SHA-256: 8be2667a25b076bcb113394eb0e36860df3120f0601b0d1c147aa2723d777e4f
font_01_sfnt_off0000cb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 16444 bytes
SHA-256: 0bf38b4e43df6e3d6cc0f619c35a50cbdd66620633c9dc185c420829c96d36cd

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