Malicious PDF — malware analysis report

Static analysis result for SHA-256 de74fb0c4a8b6cc1…

MALICIOUS

PDF

72.9 KB Created: 2021-06-26 20:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0275c32c8cd73c30e89fb4433e5f6b86 SHA-1: 2923e320e9a75c84a3f655fb58a504db0a1c6f0f SHA-256: de74fb0c4a8b6cc1219aa7cd7d0ededc73fc1f8e0d4fe999e3aacafba99e2b2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://philabc.ru/uplcv?utm_term=paracord+101+a+beginner%27s+guide+pdf
    • http://bualuang101.com/backoffice/upload/files/61095173122.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c495f79870a---54881790.pdf
    • http://iehyun.com/editorupload/file/dukovu.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b7fd61fe9b86b06f8ca56383b1ddf6b3/57592641259.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/c015f1e4b8d533ec60443e7a7d9840dd/23852714854.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8af50ee476b85a1c7753365a520ddac4/jitijelijufixa.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/0i56lnpgml1ssk1lkviqjrf381/18188601968.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gsd8165snkl3088esdfpskbdqh/82501327237.pdf
    • http://bscartridge.com/pic/35181745899.pdf
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/6398077446.pdf
    • http://congtrinhnhaviet.vn/upload/files/xokiveka.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075577ada8dd---11072952311.pdf
    • http://arebiatours.com/uploads/files/jakefetavom.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1511bf690---97095196861.pdf
    • https://aimhc.com/userfiles/file/77789425154.pdf
    • http://solamsys.com/userData/board/file/zikulepokumenedavanulope.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607391a76d153---46579269615.pdf
    • http://lovesushiscv.com/uploads/files/dabaxorejisitofulinexom.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/a57a0ebc374141e1e9ec855d4cb156d2/mezedepafedifimewozu.pdf
    • https://naucharts.com/ckfinder/userfiles/files/lomawo.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/g2pkavi4dh9d0mdn2kb6568hpb/zekimisesajupafedofiruk.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941d1612a0f---6194057926.pdf
    • http://alimentosldm.com/userfiles/file/pasaburiguwasikeweba.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_off0000b6fe.bin
1e6d60822a8a61ddf3ca5304f667d0d64b9e3fd8a6d3ff29f99a518ce3c80331
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FE 16964 bytes
font_01_sfnt_off0000e2bc.bin
7f7284ad202b3fdb15684e58caf7b078c420c68032ab426a0c0ef976259401d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 11100 bytes
font_02_sfnt_off0000fc58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 16792 bytes