Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb3ebc05ce0de89…

MALICIOUS

PDF

97.9 KB Created: 2021-09-02 00:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cd3ba0007cd2f5a196944f60b04da2d SHA-1: 0e1f3b96fafbd614a1d65c12617db286abec69b8 SHA-256: 5cb3ebc05ce0de89bbb2413abef9bfa6403b12d50fd5cfab8817241055bf8444
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the link farm structure is a common tactic for redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

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://cructi.ru/uplcv?utm_term=1984+big+brother+quotes+with+page+numbers
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/rqqpgu9bh86fp2469u22p5f5rl/bijoli.pdf
    • http://gustosandvic.com/ckfinder/userfiles/files/97808401092.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/i4i9jdccn5or9fio58l4jmg0u3/84358148015.pdf
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/145981319.pdf
    • http://crocepadrekolbe.it/userfiles/files/zapul.pdf
    • http://gourmethousemacau.com/UploadFilesfile///10923492967.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ffadfe3bfe6---34853406604.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c067f4c7c69e539dee4389d0a25a5681/xuwijox.pdf
    • http://actlogistic.vn/upload/editor/files/4699233891.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbfedad8dc---xegevagizilegamajima.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/zelalulagasivi.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f784e1db---fanunez.pdf
    • http://www.heksan.com.pl/file/luvuvuxezurowa.pdf
    • http://fotobambagiotti.it/userfiles/files/50760239201.pdf
    • https://dodatkireklamowe.pl/web/uploads/files/5147019989.pdf
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/57192479925.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/0j8pmbghrk4q8mp9dm7btk0i5v/tuxojudamoxukililas.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d8d1aa0f3a92011d1a77f17ff0d6a8c7/febiregogezan.pdf
    • http://www.photonics-science.com/ckfinder/userfiles/files/pujifi.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d7b3c1ab1314cc30b002a6b1ff74963c/57186520244.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/vusiniwilez.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/41c140639354f2799e0f79ee59ea50ec/80349335313.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/i9i0tqofnpihblq172b90cg840/13988048162.pdf
    • https://zlatartopalovic.rs//files/digifupitaveni.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/91d047cb3996fd369a319e1d3a9b0414/depipalitumedolofalotu.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088b9ee8a2d4---3133945583.pdf
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/91354614504.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_off0001146b.bin
a86920b829a030cd6f1986d33dcc44a814ce89addc78446313a871a59bab82e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 18120 bytes
font_01_sfnt_off000143a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143A5 16792 bytes
font_02_sfnt_off00015bbc.bin
67ef688c61d442064d577f46b96ae2cfcf00a0f6ab03d48c7eb0e04c09f43235
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBC 11536 bytes