Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bab24996c3d8cfd…

MALICIOUS

PDF

112.4 KB Created: 2021-09-06 04:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37265fc1380ec2be899bb7ff1083a585 SHA-1: 40a9fd0878725c990af7b4f06a4c05e26d0c1094 SHA-256: 0bab24996c3d8cfd3672c623359b748fc1c15a850c02e353fd407e68d69d0a1e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document functioning as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and link farms suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=legal+research+methodology+pdf+noun
    • http://thegroverestaurantnj.com/userfiles/files/3539705700.pdf
    • https://hkparkkonutlari.com/image/files/gibedapatowajigotobifabun.pdf
    • https://efnnma.org/files/file/52261759205.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/jfj2q1unj4mrv2rk960ip0dj45/xipafiwuzajisijib.pdf
    • http://hkbroadwin.com/userfiles/vafuwisemugomeg.pdf
    • http://frigotechreina.com/userfiles/files/redaboxudesorarisekado.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22d2018789---jonurar.pdf
    • https://angel-juicer.com/FileData/ckfinder/files/20210714_E7A3F73FE01F7C6F.pdf
    • https://cometsecurity.in/admin/userfiles/file/75327880212.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f85c7e7b82f23da26527eab16798ac9b/fiduzomajenukimalif.pdf
    • https://jamuiboe.com/webroot/upload_media/minopumisesimebe.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f3a3d8ed6---66004962591.pdf
    • http://prefinancovaniehypoteky.sk/res/file/rukugexatewigewutalelejit.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ffd9a1643---dokisojasape.pdf
    • https://egyseg.eu/ckfinder/userfiles/files/boxorume.pdf
    • http://stonebreaker.at/faniwaxinoregesimeze.pdf
    • http://montagnobozzone.it/userfiles/files/dupejagadetajivirexosadex.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/8mfd6dnh3iclkpnh1q1hs38hju/70752613145.pdf
    • http://majorpropertygroup.com/userfiles/files/vitojagulibewisuwubini.pdf
    • http://jncs.kr/page_data/file/20210721214143.pdf
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/56745869310.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c93733d022c---32804197591.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335690d8204---50906134169.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5a8af319a4413828035171e6e0f187bc/32071578963.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_off000150ed.bin
5cda5e6d4c17bebb77fedf5d5c423648dd803b3ba9b83f7ce45aa021e9eb6c62
pdf-font-stream PDF embedded font (sfnt) at offset 0x150ED 11148 bytes
font_01_sfnt_off00016aa2.bin
d49d1713dd2b16c31a75cea8cebe10247d246afa4b3934817e8c6a432b80bde4
pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA2 18988 bytes
font_02_sfnt_off00019b7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19B7B 16792 bytes