Malicious PDF — malware analysis report

Static analysis result for SHA-256 306b988c64e09cd6…

MALICIOUS

PDF

87.0 KB Created: 2021-07-03 03:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b45e533597b9f902cfbc6ae928c800f SHA-1: e711173600a6481e45241530473495430771900c SHA-256: 306b988c64e09cd6362efc1945412ee3977c7e7518c22fb5058c4c7c9c085cfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, while 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' highlights the use of compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=our+father+piano+sheet+music+pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/2fd31028a3a4e63c04bae63645316bb5/dalixobamos.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c35c7fcd0---75455603998.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d299132b707---10883747720.pdf
    • http://yokohama-model.com/userfiles/files/rojozesolujepegiliwidabo.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/0a1c1855f9686ab1fb9083bee06fdf66/kevopa.pdf
    • http://alliance-ic.ru/uploads/file/ganosisirepexufifix.pdf
    • http://alarcon-v.com/editor_upload_image/file/ragozefusopa.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/gj8aitq8abat7ut8o87ou721ue/55426253119.pdf
    • http://jshtextile.com/UserFiles/file///bawitadonope.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c985380a62---xufanajarosefekikulome.pdf
    • http://www.findvoters.com/userfiles/file/voluvirixowemifimisugi.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6bfd5jk22tqq98bo5rangf89k3/89920122088.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/chqn6vr3qu3e9rvmo3tut0t537/borunefisimekux.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0e49962ba825b5914751d5e8f6a588c6/lujazitakupugogaguvevizod.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0afd0d7086---rujelewuwojume.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0099a1d77e533fceadb2c0bf1f1bb0c5/76252827987.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/35720cf95d7cf362c86c4ed9b04683fb/rotuwudel.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc2aa7bea3---56844612033.pdf
    • http://cp-tournament.org/ckfinder/userfiles/files/40836941869.pdf
    • http://ccswcd.com/userfiles/file/sekutufiridixexodajidago.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607653e8848d2---22114503423.pdf
    • http://wabasnb.com/files/fckeditor/file/120446180160af7897a4ddd.pdf
    • http://skolicka.eu/foto/images/file/kuxojaxobagaj.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0a382928---potuzokozetefenoluj.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d75aa5caf---pidamegixakim.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e80874b71b---nunitipofomumeveji.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_off0000ef25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 16792 bytes
font_01_sfnt_off00010737.bin
f9a7f142e3eda25b61af266ef5888b322c4a240a06de6fcef6929ed86efdcd3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10737 17436 bytes
font_02_sfnt_off00013521.bin
20c05e9cd4893fd19dfbf00d15239526dc507e552cb4305d173d8a70ebf8a36b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13521 10964 bytes