Malicious PDF — malware analysis report

Static analysis result for SHA-256 81abc4dd9589d571…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 16:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1e78367344c63f0efe0e632e589085a SHA-1: f37c320ec178af1dc6757b948b3a5c04a811dd71 SHA-256: 81abc4dd9589d5711c394cc182996797d51d4df1d019ad98a729ee3c2e66626c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious. While no scripts were extracted, the presence of numerous external URIs, many hosted on potentially compromised or disposable domains, strongly suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd1208e27---virezaxiwi.pdf In PDF document text
    • https://ivanda-commerce.hr/userfiles/file/62389719937.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/68581091280.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/7ce2msov57j54ve8baogt3gbgf/tuwexagupevu.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/rurunevameni.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/99226884833.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/bopovozenefex.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/7217289932.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afb5dc9b91a---54337778048.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/2d3bc41de6109e3f5c29ceef86e476e1/14916990533.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fopisatasi.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/2195402072.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c2bc24880---gukusanuvogosopo.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/mu0to9rhffsihj8geq6armo1p2/95355648428.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/beripijoxiguxaseserixuref.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7f40a30ae---bizafenar.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160908b725eed0---89020114250.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c49f7d1fa1---95396807616.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f26ccc1782---91764060386.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/51135704009.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/vulelajiputazozibopivogo.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/61280539657.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/remogesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=nsca+cscs+study+guide+pdfPDF 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_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 10616 bytes
SHA-256: 2e9b4e039330d0f18aead321eb347e330c7e9012272de24a3f8e6de8edee482f
font_01_sfnt_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 18360 bytes
SHA-256: 85e2040272c71f78ffb29e23e58b36fb7b7a7e46836579a866479a59debb027f
font_02_sfnt_off0001259a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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