Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ae75be18b530a4…

MALICIOUS

PDF

64.7 KB Created: 2021-09-08 08:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5bc7f6eb1adf0d8031efcf5232b6e23 SHA-1: 6c883a74d1c5de58c23b30375322c44aa1225ac5 SHA-256: e9ae75be18b530a465104d9c0c2989892db5ec052dd6bd7c53427b8f8f7bccb3
154 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 URLs, many of which point to compromised websites or disposable domains. The ML classifier and ClamAV detection indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and links to compromised CMS uploads suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6279

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 http://thechelseaff.com/user_uploads/files/52449837558.pdf In PDF document text
    • http://www.astmalek.cz/obrazky/file/9566969174.pdfIn PDF document text
    • http://electric-kernbichler.at/fulepojaxi.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160741c610b9e7---nozenofevutoxokajuduxa.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/lh543re83c48s3884chjvhebdr/48621330323.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/gisutasa.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ipi65fhd4u9jje8as46fks6f85/sabetadebuv.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/rebufobafijuzugatopolowax.pdfIn PDF document text
    • https://ckmandarin.com/uploads/70922965012.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/i3s9t2qvts56ba80tvi61ftvo4/52056384427.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/xiwidagivaze.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e9189c920---fadamatow.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/57350282283.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/1081691256.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/98751c1bbcd960d2c007bc78cd8d28d6/zugeterovaw.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/4114565398.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610abe778a202---devum.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e381dde5a---72684243310.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/21250539321.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8913f6b3b5d34aad75fe36b8e693c67f/danamumipenuwumiluvirib.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/jolerebadazuzure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pvc+manufacturing+process+flow+diagram+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DE 17080 bytes
SHA-256: ed174c1444f44c6414c69c96a8026d943b7cd9eb92f35d2e84d33247dfea973d
font_01_sfnt_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 11216 bytes
SHA-256: 67aa7d374ff6fa2077bc7c638522319e449ea91cc45607d4fdd685ccd6743e57

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