Malicious PDF — malware analysis report

Static analysis result for SHA-256 e07ef33dba8bf857…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 01:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1dddeac922dac0281daee0da4413fc79 SHA-1: 6167af76c4b5e49005658963dc190da74d8787b5 SHA-256: e07ef33dba8bf85758f9fed1f5e53666127f8a90a90cfb2c0c9279d49896898a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of multiple compromised CMS upload links further supports this, indicating a tactic to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=oral+anatomy+atlas+pdf PDF link annotation
    • http://igabana.com/upfolder/e/files/20210601192347.pdfIn PDF document text
    • http://aimic.com/userfiles/file/nikepibuwaritigofi.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/pitebapakupuladorami.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i6t98t9r63j22nlq3s0pu7g1c3/siposuwanugudemuduf.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c04f2cf02734ebd17e1504d0031965a4/5973537979.pdfIn PDF document text
    • http://m2m2design.com/userfiles/44722987773.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/semibivaxapudakoj.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/56686840405.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/1810532061.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/vebapofelefisimelu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6745b58d4e7e3a30c7fb94d3aae93017/rovelafaxosotorifodirizir.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/4vr1754rnolgoo1tutn2u4m2i3/24067267091.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34f3053db---71000000880.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4dda5557d---sidugobakavezijolitowef.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9980dac750---pumufapugizusutasapewax.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/kifapa.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/xogerafaxila.pdfIn PDF document text
    • https://preciseenergygroup.com/media/53868723067.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab48358435e---40332225467.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/jujovevumedomew.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/doxofize.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/fefetame.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/a6b573a0a09e2a5e38ebba8f408b9301/dolexoledidife.pdfIn PDF document text
    • 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_off0000ce1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1C 10572 bytes
SHA-256: d78dfcf981879e0c559bba8772d4348b44409a050f4d1ac79e37730295c1329d
font_01_sfnt_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 17992 bytes
SHA-256: fd55fd3752c3900586aaf796ba066ecadf95e2faa876a74edfa270cc0f2d7048
font_02_sfnt_off0001149c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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