Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a70e7bde5c94ef…

MALICIOUS

PDF

87.3 KB Created: 2021-09-09 11:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b7207819704c62a222776cee32af0f8 SHA-1: 9a75af40591b9dd4f6bbca6ad42644931e8849c9 SHA-256: f0a70e7bde5c94efb8dc987b5eb01d0d5e65ef761ee9ead4d75b4fc7d949f8fb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://ydtmuhendislik.com/ckfinder/userfiles/files/22010643666.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135cf521b7da---96166573095.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/wugame.pdfIn PDF document text
    • http://ridendo.cz/files/file/79404649555.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/49510809869.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/76517608075.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/68615182728.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/79445250325.pdfIn PDF document text
    • https://posh.hr/files/genalo.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/tipebipadobipime.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/xapebibavan.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/47582012283.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/30657008799.pdfIn PDF document text
    • https://megashina24.ru/files/files/dojedizalug.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613980c2c75c0---famebazilotiwopebumokuje.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/zozegigidetag.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/599976b24971e41620c55abe454cafa1/45247325950.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/92340960633.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/ponukamasiriseno.pdfIn PDF document text
    • http://apismorava.eu/docs/39362072043.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/jetubup.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/51210520321.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/kufitobawimobokoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=good+rpg+games+on+androidPDF 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_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBC 10632 bytes
SHA-256: 2fab621248295c40aa1424ea3250d6c4aa86a182ebd4d4bfc4aa72273ba39a87
font_02_sfnt_off000123c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C9 16904 bytes
SHA-256: e9143ff63171a65da93df470a500cd1e586280162e3c49086f97d7f4db3e2ac0