Malicious PDF — malware analysis report

Static analysis result for SHA-256 25eb756af7e823ed…

MALICIOUS

PDF

113.5 KB Created: 2021-06-28 11:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 87db3646cd586102007ede33a08827e3 SHA-1: 5d13dac13edaca3306176cb09d21cacaf89f73af SHA-256: 25eb756af7e823ed451bec88cb7327462863f811c60d8371fde544f42e2296a1
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a phishing and trojan delivery attempt. The document contains lures designed to trick users into executing commands via clipboard manipulation, specifically requesting recovery secrets or private keys. While no scripts were directly extracted, the presence of numerous embedded URLs, many hosted on compromised CMS platforms, suggests a potential for downloading secondary payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/l01cnj82ngqv3dr96pmmr7rv15/nuluzejusin.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/xajejakulekonexamulix.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160805f083b9e2---6237146960.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f79e509c4---50789492100.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/c6f8267482fac38093aa16139b5e17e1/58677896467.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087b311af2a3---betuxorixigopunuf.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084d506d4b34---32134578097.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/aoc67orn7mveofekc4lsguflvu/45752535494.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/6e7cfa970b17c26d5b2a93006138ef46/54040614716.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/94bd50170b87366af8574b2e9de759be/fojexujuvigikanuduxobujez.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d09d19c9d---91100212373.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/rejeziluze.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/tomonuxafupeweliwi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1th7rr0cjag0b08uf0ev3tdutn/18381068758.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/giveparali.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/32475841469.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c14a25ef9d1---minuwo.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/44899874269.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/54279514435.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/40666987700.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/n62i5di2v80c8rkaufo1523j90/8444870678.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cad3c115d32---worubokamepetuxavol.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/44129560461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=code+step+by+step+answers+pythonPDF 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_off00015621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E33 18756 bytes
SHA-256: 90c71bc497dce9b4b4d6776ea51a7304bfcec7820b2329f1ee402573592b28a5
font_02_sfnt_off0001a05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A05C 10724 bytes
SHA-256: 0b941709613ea4691549ab00af5cc036183b40e5c8f2fec3307244e282746d86

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