Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad4ca938b7e2c3a…

MALICIOUS

PDF

246.0 KB Created: 2021-06-12 20:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0a444cd4e98ead2452993037b1181d7d SHA-1: 063afc50766d10a153193e3577e2dfa1c736a587 SHA-256: 8ad4ca938b7e2c3a93f0bc96b1a116aab1e93d15a8b95b0e98e3b6973642ea77
286 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF document exhibits multiple high-risk social engineering lures, including requests for recovery secrets and instructions to copy/paste content into a shell, indicating a strong intent to deceive the user. The presence of numerous links to compromised WordPress sites and a specific URL for downloading an APK further suggests a multi-stage attack aimed at delivering malware or phishing for credentials. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 9

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=pool+guideline+tool+apk+download PDF link annotation
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6d83b9662---pedixix.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608781992dd49---50482320924.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/5377921428.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/xibazorolidurilaxovof.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/16qmml8q3qgn71c9dr6jlfanpn/49098646636.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3cfa1ec01---37467017310.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6e2715fb2d07f6fad16d445c72db2463/dililasirevapoguxa.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/56963195398.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/rrbm1ihnicelmlhbn613a3s6u6/47740455710.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ed5576df3---61967959340.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944db911224---risukekosu.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/53163820255.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc208da8776---9485790330.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075c1ed70610---70679309405.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e7cf90aa9---fupaxigapemejivakusifanaj.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/87500968762.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000377ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x377ED 4892 bytes
SHA-256: f9bfdb52b1f8be1267213018675f0b1b9aba8f708b3da03cc3e490ff7561c3b8
font_01_sfnt_off000388b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x388B6 13016 bytes
SHA-256: ba99b49069d5ea4da3462f48d95c158af9d7ae643355e5bfedfdfdfb61edc286
font_02_sfnt_off0003b3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B3EA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
font_03_sfnt_off0003c19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C19E 1736 bytes
SHA-256: 74be5bc4d46f64e5c506ae1006f7022dc98ebf960e37c7bf417c2027ca73106d

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