Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e11f4d4d95c413…

MALICIOUS

PDF

102.2 KB Created: 2021-06-29 13:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 535884626d9dd5e028734bf263072e65 SHA-1: 6f2b4eaf4fe3896a8821b7b76aa3cc21af12ab46 SHA-256: 40e11f4d4d95c413d9341ada391935b46e547e114cbc5c444565237b44d7cc1e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. This behavior is indicative of a link farm designed to redirect users to malicious content, likely for phishing or further malware delivery. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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
  • 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 https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/7af2b6197ff99abd1be9f8dfca03dc10/44173146382.pdf In PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeba6e8b10---vewenumidepexawusojurikak.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ae409ae92df2a9a002ea8a177f049c68/lemelawamidirotuwagupog.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/23e076791a1b58821d779d714c8e3ee5/65978949068.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/dfdf25cd91fa3728f2f1244b903ff6cb/wepomifugavenowi.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b832b0f2783---firemu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a5e97cb9a---31117263228.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e955899e30---63976267041.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076b22ddf3b0---57941509372.pdfIn PDF document text
    • http://usa-ex.com/14810967140.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/35137183591.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfba8aa58a---59450480239.pdfIn PDF document text
    • https://hoalavender.net/upload/files/33562825006.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/zerabe.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/zuwogapenigurapipibir.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/24/file/kunabodotot.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/6b50e130252e8669e7520062f607cc02/pajov.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/d806a6bd35e98180c5bf6324feda6527/94241096867.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/2ab51da9ef9ce18158f6d2256f963f9c/9357966165.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b2218a88859---vedonemuzotuza.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9993vcuj19g0q03gfrpce7lqmt/80638994028.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/sugedejulasugaxawizeruk.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/89719850272.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ddb9532b752c02f812da0ecb1f5cf508/sufekulexitovulowazubekuk.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607295f21e86f---77935366227.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/16c34769b32f7e4bc14edba0e9dce116/newuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=poverty+can+affect+population+in+all+of+the+following+ways+exceptPDF 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_off00012f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14791 15752 bytes
SHA-256: 662c49b38d3148611b0acaf0d4ccd2686a7952132b377cbf06b9d8bb4a877d72
font_02_sfnt_off0001701c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1701C 11228 bytes
SHA-256: 17cf6142711a51d54145fedf221ccdc06b8573be65448d483fecbe4dd358f04d

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