Malicious PDF — malware analysis report

Static analysis result for SHA-256 938ed4eec2bd8d97…

MALICIOUS

PDF

83.6 KB Created: 2021-06-26 09:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 141d59f0de1847c8eb491949cef38977 SHA-1: d89a7e2b91461c83adaaf4ab8d41e74d9b8180ff SHA-256: 938ed4eec2bd8d97ae0bf25695c96454902c0f22cc482ebaf195f1412bb91966
204 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into believing they need to download a password-protected file, which likely contains a malicious payload. Numerous URLs pointing to potentially compromised or disposable hosting are present, indicating a distribution mechanism for such payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ats-dz.com/userfiles/file/28757651105.pdf In PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2f7dabb90---62016241565.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc5fda11da---6563600391.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/45741492903.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/k0eu5ij4e1jl161odcjodhm6bu/67481022183.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/901c608dd626bfd2dd09f6b12a735175/xalevanafi.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/59199161440.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/14ittaftsu676adkcf2gr5q5l8/31098346716.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a09807a163d841f2a5e2945407765d7b/povozadomesafunuka.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/7239865613.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084a5debd55b---41667098354.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7642eae5289e94af983d82a16c8695c1/genuvotogelikupuzapo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f27fad52d1---suritiromu.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/tuxijogegu.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/7f2bb97edc8c8219745e4aed7b5ca812/vetowararenutufitatememur.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/860a445ab3255f655b9928c94dce874d/betedo.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/43693195079.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/u4eq9du7sv18d32t0af9fvp4f5/53919070780.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/10b7e1d305d154b9f57bc6da09696fe6/27213094869.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/457ab0c37f0787082c30121c2f39642c/luzokuzujigigifopim.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/hdejrd7kh3gl4jhnp8srilu9oi/46083248585.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/6i89muicuk1thto3polal8i736/28356588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+minimize+mb+of+pdf+filePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 17068 bytes
SHA-256: c1ec516a0c636cde0963e60b32e1a5ef5f177181302d7c2e7bb6e0a60c9c078f
font_02_sfnt_off00012998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12998 10508 bytes
SHA-256: f0d8f100fe99c3ca85517c657bb322c0240041f62571f34f665f1419a0b80126

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