Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f81be12b8e51ed…

MALICIOUS

PDF

128.4 KB Created: 2021-09-07 12:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 615877898f769d3795f379debad26646 SHA-1: 3f4708e24e3033c0aa58e04c762358915c3f2c51 SHA-256: 05f81be12b8e51ede3d039b03feeba4828417cdaf1e0789f6146a322c2c220e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites and disposable hosting. This suggests the document is designed to redirect users to malicious content or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mail-ex.net/userfiles/file/tokifawotukaxuzogasoz.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5b1p2kn5bq2lkm6kdp9fogqjs0/22055475020.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16114236edc511---80979372246.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a1b746ffd---85353274070.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9e295f139e4cd9308464a12c35a21fc9/3475191970.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b4a50d968---surowutuzudurabemovo.pdf
    • https://debcopharma.com/userfiles/file/43019469617.pdf
    • http://blevy.com/ckfinder/userfiles/files/rexagozinafero.pdf
    • https://bursac.net/userfiles/file/154655228.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/89405952076.pdf
    • http://hiredriver.com/uploads/assets/files/54792756242.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/cc20bc448b9dca77e8c8e788f76518c5/79457299140.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2ad0eec82e8d5ffa5b7abe02ac67dff9/fedemelegoxi.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/2hi38h5dc5k5c27tnqv7d7sfng/sagadubizedexixesevo.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607926c52b88f---xivuz.pdf
    • http://arabic.cz/ckfinder/userfiles/files/pemiwolegef.pdf
    • https://alternativecarrepair.com/userfiles/file/35095695158.pdf
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/jusizuwuzo.pdf
    • http://arslanemlak.com/E/file/lozefinatomekefokozifu.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/15d7da22cda60e69155cb2e79b6d8369/23945529514.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/edc0af3230507dd18a3e31e022629127/merukudasebifin.pdf
    • http://polipack.ru/content/file/39001646710.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+download+magic+english+book+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_off00017e4f.bin
aaf83e839189a940fdc0e613270c07a9d043a19936860e3dc1e915c96239ee47
pdf-font-stream PDF embedded font (sfnt) at offset 0x17E4F 26680 bytes
font_01_sfnt_off0001c1c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1C7 16792 bytes
font_02_sfnt_off0001d9de.bin
8f1c9895aa57e9774396be3b780a94ec86ac7d6bc207be5ece61e111cf86a4e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9DE 11264 bytes