Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc4dd71c4e7dc58…

MALICIOUS

PDF

90.8 KB Created: 2021-06-28 20:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6784a33203e9bec8596dd57ae53dc889 SHA-1: b2e7a531da42f3a7b3289fcbc78683260aa3a0ad SHA-256: 2cc4dd71c4e7dc580ab1e5c0420067cf44951fd89d7e7dfd353a8af8bb8730a1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and 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. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

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://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc4db0f204---xuwifidexe.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb3725b920---sedaxizosonoronenalab.pdf
    • http://www.cerel.eu/images/wyswig_images/file/87648662637.pdf
    • https://ktmcollege.org/public_html/userfiles/file/zonokamamen.pdf
    • https://majorsagilekvaros.hu/uploads/file/nugadixoxakax.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3c7nueo9pbkdt13pmraejb2r8o/rabebuninosanilexexipemu.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160724945ddd77---jezilixixe.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075d991503b0---jigizedoduguwuvetobaz.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607454c7e1968---73263289518.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f7b152db9---pagozimanexo.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0cd202a8---97974997846.pdf
    • https://aduanaldelvalle.com/userfiles/file/45901733472.pdf
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/52geqpns3qcl47bqk0i3iv96k4/getivoridizaletovupetijaf.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/955935af22eb704d09188ec7c6abc4ad/72935802480.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/88affd93b41787713e25dfb7beb86a7a/85178882506.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/pmqb8uba5gpajk1e4fk2bh7qup/36699072782.pdf
    • http://bahattinburyan.com/userfiles/file/vufalajijadij.pdf
    • https://peilimineko.com/userfiles/file/7341498976.pdf
    • https://amblamy.ee/upload/file/60376694331.pdf
    • http://cesishotel.lv/res/wysiwyg/file/vogibirexafoji.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/78215eb9df3809f62c631b073962a24a/joxerojametemom.pdf
    • http://transfertrolley.cn/d/files/tapimuzopasolemes.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c19a579ed5379d17d4e95883d05f71ae/47566269168.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=egg+white+mucus+before+period
    • 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_off00010068.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 16792 bytes
font_01_sfnt_off0001187a.bin
4ef27b1c309f15916d4a1e7e7b2fbde8705ed1fb1540859dff9b42635186d1d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1187A 17004 bytes
font_02_sfnt_off00014483.bin
16f952947dbf76ec30e10fc7c092940b4b7e2903d611da4c53d82fb9378a08e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x14483 11064 bytes