Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfd67865b87c63b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 05:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79e9c71f9abf14319e182b11b2e0d204 SHA-1: c71b7166eac48bbff89037850f2cde344c753dc6 SHA-256: 4dfd67865b87c63b26145adfb369b7b4d785b6754148e44622fb4aa03111bbdf
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary goal is to solicit sensitive recovery information. The presence of numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggests a phishing or scamming operation. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest a phishing lure designed to harvest credentials or recovery secrets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • 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://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/85578035706.pdf In PDF document text
    • https://didacostruzioni.it/userfiles/file/22823608058.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/mesinimelugawoke.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/1975940731.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/87521254191.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16088329906781---xukuzewobosikifuguk.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94dcc05348---ramuxagakosisazakufef.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b815b2d7ea0---duredulunove.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/089e0d88028ff7903672c9e4e6b6c282/wixobaxiruvezusivowoba.pdfIn PDF document text
    • http://brukbet.com/user_images/file/vakim.pdfIn PDF document text
    • http://klpa.net/userData/board/file/vebapizadazutolebusu.pdfIn PDF document text
    • https://sharenkon.com/files/givodabituvavobixixifuji.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/27252804651.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/nezanafogomatudorepa.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/218804dc82ea851399771c60ba08e8a2/gaxuside.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16128d6f45d2a6---33750242359.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d8841a8979a9c010ba295dfaf42e53c3/suzudavab.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b2432b0380e02b4ebd9c2f0d4fb81277/vakife.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/92701632829.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/nurowamugum.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/97940503876.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/52439382048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=asymmetric+key+cryptography+pdfPDF 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_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 11104 bytes
SHA-256: df88451f719cd1b8c82d373a0479d793660cd94974123de4474a860005343dbe
font_01_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 17596 bytes
SHA-256: 48f37f5e976c3724f1efcfad505fec276725ef40b4e4b4f71ed19467ca42d084
font_02_sfnt_off00012325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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