Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ab3de08877ebef…

MALICIOUS

PDF

89.5 KB Created: 2021-07-02 15:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c468dc437a57507612bdccf0e3ea1b7 SHA-1: ea7f2584a2f7133bff50d2e8a1baf7f811d60432 SHA-256: 12ab3de08877ebefc1c73c2c3fe3a35c3eb69d010263166737e2cae1b07a5ecb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://geredekombiservisi.com/userfiles/file/29009973506.pdf
    • http://unsersohn.ch/images/file/3524803774.pdf
    • http://b-solutions.net/userfiles/file/bituzokupekuvudikugek.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fe61409b0---20236141005.pdf
    • https://eagle-aviation.com/userfiles/files/mikiw.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6687881e---pilobag.pdf
    • https://vgi-vn.vn/app/webroot/img/files/12692218268.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/420uaf08epc99bjmusg3665u23/guzezakukixijizigarafiw.pdf
    • http://kaies.cn/upfiles/210628124701294391f0sil9.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609630225c204---nimafiwaxibivenipikurim.pdf
    • http://brightwayconsultancyservices.com/userfiles/file/vimunegazugufuv.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d7d70cd0---74893874998.pdf
    • http://hoteldazegliotorino.com/userfiles/files/60773776029.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/u7png6q3oggkrt41ba3ioea9b0/75717366153.pdf
    • https://securitydm.rs/slicice/file/pidogupomafozajabuva.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a14f77669---felunubil.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1fd3e158332cd53ade9e2d2403a55d14/kizaxukoleror.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc7fa511d9---duzasewixixenexinunos.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/5224042307.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7c446ebb5c0ca8799517a89045408186/27914184140.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3ce2c0af15867eee49a59bf207f6ae44/8158318996.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/sijuwolezukipaxuxi.pdf
    • https://poolpoint.be/uploads/file/31345575120.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089410703656---40727886394.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc9e7757dd---32267111365.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cat+american+wirehair
    • 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_off0000fc08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 16792 bytes
font_01_sfnt_off0001141a.bin
e40828c120d8f96f0b7c0865bfa2faa9728d85b21404f87fe4883f9153a143dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 16932 bytes
font_02_sfnt_off0001403a.bin
ca7163974b6668b0ea049c8bd509cb06421be12ff180d0c0b96f3c1e44c2a70c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1403A 10276 bytes