Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bac7e8900421ace…

MALICIOUS

PDF

76.2 KB Created: 2021-09-24 05:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9e116c95b10bcc9d1806f292073291a SHA-1: 31ba9048fc3e1b05cefcdfaa4e98cea6652a5df7 SHA-256: 0bac7e8900421ace803a9d05a3ac4cb1a8d770919514c5fd0c2fe77a8229c5ad
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on potentially compromised or disposable domains, designed to redirect users to other sites. The embedded URLs, particularly those on compromised CMS uploads, suggest an attempt to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5861

Heuristics 5

  • 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
  • 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://zoldlaptop.hu/ckfinder/userfiles/files/37532070504.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/39874035233.pdf
    • http://gsmontaggi.it/userfiles/files/xituvubakod.pdf
    • http://mcap.cz/images/uploadedimages/file/pujuped.pdf
    • http://kroonzuivel.nl/ckfinder/userfiles/files/44081544061.pdf
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/89266830734.pdf
    • https://sportsslife.net/upload/ckfinder/files/zobuwinabarelitobus.pdf
    • https://safewatersolutions.in/ckfinder/userfiles/files/vagudaxudovajewe.pdf
    • http://lachambredechos.com/userfiles/file/vokedotetujezev.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d63557a5f---36752674189.pdf
    • http://apex-architect.ru/images/file/gozageke.pdf
    • https://amt-alarmy.pl/userfiles/file/27796022829.pdf
    • http://wksx.top/images/userfiles/file/208390169.pdf
    • https://www.thaiahpa.com/flash/files/67891782880.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d580fbb910---lebupizot.pdf
    • http://allier.proximeo.com/ckfinder/userfiles/files/suwemalikelugulat.pdf
    • http://sonnenheizung.ch/fckeditor/editor/images/file/denagef.pdf
    • http://ppfi-online.com/userfiles/file/ninemanekifekaru.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf4e66a68d---14590345852.pdf
    • https://sanmuabancongty.vn/images/content/files/rimasurexemetew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=amazon+freetime+android
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc9e.bin
996ddec52105502f327538289a8db009b68dab9cdb790f99003d23ce3ce5cbb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 10344 bytes
font_01_sfnt_off0000f3fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 16792 bytes

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