Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22a23023bc99509…

MALICIOUS

PDF

62.4 KB Created: 2021-10-03 05:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4000062c737954e4a9bac3921d523be8 SHA-1: d721ec5260125569a0f2ce816d3f5fb4890fc1b7 SHA-256: c22a23023bc99509563a1dd4a43ac068b1bcce8ebbf6b93a087e4eb7be1dc477
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and other disposable hosting. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5277

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://laznia-radom.pl/userfiles/file/xodaj.pdf In PDF document text
    • http://svazekobciorlice.cz/userfiles/file/rupisobepo.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/34392409002.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/62714685155.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091214034769.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/44931118260.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e43e2b3ae---39227961276.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/39984845105.pdfIn PDF document text
    • http://gojjang.com/uploads/files/soxukixomugujifizukapujoz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c848d7a1---nuramak.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/jotogogazuja.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae01f6d272---xufukofenakiwesotakojorem.pdfIn PDF document text
    • http://digifast.cz/userfiles/15831757593.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/53312395162.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/1378f8a763dfdf61debf57491c9161c8/godoberarovemepuxub.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6cti8b2e4a3qkukv8je97g11s5/momidasuwuduseli.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ion1lrh2te82r4e59641lq54r5/derezajoxovaxuxal.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/52281271435.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/73804641687.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/83809239450.pdfIn PDF document text
    • http://wohingltd.com/userfiles/labugegunaletujijogowi.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/95558567712.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/ribisukumetukugurerixezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=photoshop+change+all+black+to+another+colorPDF 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_off0000af2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2D 15108 bytes
SHA-256: 11fc3b424822e21a97249a968f6ee0925b7bd1e59c47544b2141c42196992e53
font_01_sfnt_off0000d513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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