Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ff86e53fefcbc8…

MALICIOUS

PDF

96.7 KB Created: 2021-08-12 14:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b09d3de46e74839071b44db6b0ffaab6 SHA-1: 854185e75b60dde05848b49a94231f11726898b1 SHA-256: c2ff86e53fefcbc82a8e022c13c656722161537fbeb0f39d6db087f61b32c725
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://kaushalacademy.org/ckfinder/userfiles/files/19307174772.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160984afeb2c57---56643024846.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/garaditasixetamuda.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/fe86cf04b78635269bacacbef6739402/toridiwifokimozuvojapuzaf.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160802e34cc42a---lorepunoxovibemizulazowop.pdf
    • http://highgaincomposites.com/img/file/20218111420.pdf
    • http://cuboni.com/uploadfile/hong202108040047346410.pdf
    • http://zulassung4you.de/bilder/file/lukefem.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073337ef21e3---74764804120.pdf
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/suzobakuloxiwokijiza.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/5771a9fc13238d3749437591a2a8ef00/63337192917.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9f029478e23e1dcc6f09bd5e1f4d49f2/2552138064.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/201d6b816418169cb5fee3cb9e5bfa31/soruke.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9719749f4c---53543513201.pdf
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/75823011840.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608548ae6a135---bexakezuxapowoseke.pdf
    • https://biographiewerkstatt-singer.de/userfiles/file/18009222401.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-7-22/20210722021735380220.pdf
    • https://sokolzgierz.pl/web/uploads/files/80250829581.pdf
    • https://shatalarab-llc.net/userfiles/files/34604752490.pdf
    • http://brmhn.com/userfiles/file/20210610231856_u4m3pn.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9077518d7---fedusigalogepenori.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16109999930020---fobitir.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdaea8e592---75310996567.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c4861fd4107e39da03ccc89bdf3d1092/zafarebemegazim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=5-point+likert+scale+range+interpretation+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off000114b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114B6 16792 bytes
font_01_sfnt_off00012ccd.bin
868bdb9941af3db098cc3e72aa375e06b3d04da660268f332fce1ae1dda9da13
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCD 10956 bytes
font_02_sfnt_off0001462a.bin
0649c6f6fbc19eb803b3455d731db3f8e9dbb56a5d52c2195dd61d70e0e3f2f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1462A 17564 bytes