Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e73d8c95a9eb2d…

MALICIOUS

PDF

92.5 KB Created: 2021-09-06 20:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ebee2fda50fe0bdc296c3fb1dbdd9c07 SHA-1: 6bf0c46cd8bd8b4549f49a4c52255575ad511dff SHA-256: 04e73d8c95a9eb2d82dffa61b1eefd24ca198ed8499a4d3781422a11d7a7baa9
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical finding for requesting recovery secrets or private keys. The document body is heavily obfuscated, but the presence of numerous links to compromised WordPress sites and disposable hosting suggests a phishing or credential harvesting attempt. No scripts were extracted, but the overall pattern indicates a likely attempt to trick users into divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611484552daa0---81694477123.pdf In PDF document text
    • http://minhanh.com/files/watowarubujuxuru.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160884a807829c---xavawukorixurezitoravinov.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c22eee238ed42f27cd5bb1c98336da78/86520707905.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/sotidizexu.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/tuselamakor.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/futinotevifumesogokupa.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/39760409955.pdfIn PDF document text
    • https://bselink.com/userfiles/file/wudiselewezupifam.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/94882239213.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/wojonurutijusutexigeper.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1be58c4733aca21d1cb70285672370fa/rafugadewesajav.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/81571t0f49pgro9cofl6ghq8a7/13040603100.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b564e98344---gupitupasid.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb6af81d8bd---mumixoruwufowenaratonodoz.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/7040383565.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160877b09ab04f---minod.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ddfb19d1ae0a71a3c29ad57313264a21/42497842763.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/81145898331.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/zomutepeb.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210611_4A35B809C874B0F0.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/bsc6o0lg1s7add37isgita8gp3/90623213231.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b31670594307f6491ef42ec22aa1c860/41724760371.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9f0eca62c947bf031e3bd6be42c0bf27/porogubinujinanabajomepa.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/1d6abd251badcd2c3d7853896e5635be/kuwoxefafaxowedumefedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=manual+leica+geo+office+combinadoPDF 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_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 10688 bytes
SHA-256: bd197afb29fd434481a911d111d2106e285cab0b0967b05796ae4e34457a9cbb
font_01_sfnt_off00011960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11960 19492 bytes
SHA-256: 874ad35af2ffd4bd38e7450e90768d913222c55495771605beb41b4ccbb3c337
font_02_sfnt_off00014c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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