Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ed774f7b3cf2c9…

MALICIOUS

PDF

71.1 KB Created: 2021-06-18 16:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00b1dcd3b0ee514cfa0ec2a8e6afcbb8 SHA-1: a72b6d56e15142835dbcbce1c8b0ef0793b3837f SHA-256: c7ed774f7b3cf2c910a53b806b6a66063615c94fac23ecada0ed021ce90204b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution disguised as software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=sims+3+free+download+pc+windows+10
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7ea43082---fusemapixijewokubuterezat.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/059dea9968a4444b3ac598fffac70494/gedaxuwujibujux.pdf
    • http://sarljarry.fr/userfiles/file/winiz.pdf
    • http://sincaremedicaltour.com/js/upload/zafatigebesajiwadimeko.pdf
    • https://clearpatth.com/userfiles/file/25677503239.pdf
    • https://emprenderem.cl/files/mamifosowopelal.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/2s1a1gh8htgrt12s9hij8ri7bq/meputemabijidomaje.pdf
    • https://anukulagrotech.com/userfiles/file/7272057037.pdf
    • http://bioscipublisher.com/files/upfiles/file/fijabibenaperex.pdf
    • http://shreejians.com/userfiles/file/ribevutisuwe.pdf
    • http://intergeored.com/upload/File/40544585256.pdf
    • http://dzstock.com/Upfiles/file/kituxofasatew.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a031161e141---18996212550.pdf
    • https://saunadlaciebie.pl/userfiles/file/35917151197.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070225c153e1---fikaxitizusuwukovib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d941.bin
a28846c85987e80e5d7c7887406ffc8ed1c7f8a07d4baa0130d4d934e1345490		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 5852 bytes
font_01_sfnt_off0000ed2e.bin
ee4312d151740f584a232f39a7481a53ca7c17486b31c8c3fe4b281e8f77f8f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 10244 bytes

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