Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac63c19dbdffd71c…

MALICIOUS

PDF

95.6 KB Created: 2021-09-13 07:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b29e3dc39908c9ef4ac2f6d01aab409 SHA-1: 387687dfedd595d3c38cc50a960b66c5695ef7da SHA-256: ac63c19dbdffd71c986b12d84fdaf41065aceb1df498cde6e9418575875438d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous external URLs, several of which point to compromised CMS upload directories. The ClamAV detection and heuristic firings indicate this PDF is likely used for phishing or to host malicious content. The presence of multiple external links suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4477

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://euromarkcreations.com/new/fck_img/file/38883449888.pdf
    • http://voijin.com/userfiles/files/7320354865.pdf
    • https://sandipkumardutta.com/ckfinder/userfiles/files/58516277364.pdf
    • http://unicorn-furnitures.com/d/files/424711327.pdf
    • https://grdr.org/paidel/ckfinder/userfiles/files/wagure.pdf
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/kasiliwufaro.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0a1672463---solisubuvepitimese.pdf
    • http://agcslohian.com/userfiles/file/46216533234.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613dffa02bd3b---98416788183.pdf
    • http://falerisztika.hu/tmp/26099914555.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea233649ed---gedoxuxoxilu.pdf
    • http://architettipassarinmarzotto.com/userfiles/files/kagazajuk.pdf
    • https://kaptenhoki.org/contents/files/nexug.pdf
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/siropopubimaxupono.pdf
    • http://cosmoscm.com/contents/files/83510733622.pdf
    • https://nicklason.se/ckfinder/userfiles/files/6043504188.pdf
    • http://1day2night.com/UserFiles/file/77224469394.pdf
    • http://dexgerm.com/data/file/userfiles/files/69832241000.pdf
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/nuvomujaxiw.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc34a00227---zopilarukomonaxirix.pdf
    • https://watosaphotography.com/app/webroot/userfiles/files/20210904_202823.pdf
    • https://procogs.com/FCKeditor/file/fojezevikexitosi.pdf
    • http://x-site.by/upload/editor/files/waguwinonobijin.pdf
    • http://rickgrisolia.com/userfiles/files/xopoxujagezumekiwidexi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=game+of+thrones+wallpaper+for+android
    • 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_off000118b1.bin
2b0ad8bb9a6e2559e827aae4eabe6ba27d4df94fecf4419b2db2c03edc79a68a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118B1 18972 bytes
font_01_sfnt_off00014a61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A61 16792 bytes
font_02_sfnt_off00016278.bin
8b9b55d51e8b5f99b6a155c61a9e449a9ed9c698dda5ac9b3df21406883d1014		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16278 10888 bytes

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